这次没有不同——’07年的教训

2007 (explicit) · memo · 原文约 5841 词
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Memo to:

Memo to:

Oaktree Clients

Oaktree Clients

From:

From:

Howard Marks

Howard Marks

Re:

Re:

这次并无不同——2007 年的教训

No Different This Time – The Lessons of ‘07

7 月 16 日,我发布了一份备忘录,题为《一切安好》。那是 6 月下旬和 7 月初假期里写成的,回来后花了一周时间才定稿发出。备忘录回顾了过去几年出现的过度行为,以及人们在多大程度上对此视而不见,反而觉得一切尽善尽美、并将持续如此。文中还谈到,牛市里投资者反复出现的一种倾向——觉得“这次不一样”,以为过去引发周期性高点回落的过程,这次不会应验。

截至 7 月 16 日,牛市的气球还没被戳破,有人可能觉得我的备忘录过于悲观。幸亏没再拖一两周才发布,因为到了 7 月 30 日,事情开始恶化,引爆点是次贷违约以及基于次贷的证券被下调评级。

“孤立的个别事件,”多头如此回应,这是大坝出现第一道裂缝时的惯常反应。很难相信,不到五个月后,影响已波及广泛,重大损失相继确认,悲观情绪取代了狂热。没人怀疑我们正深陷一场全面的信贷紧缩。但就此而言,这次确实没什么不同。

On July 16, I published a memo called “It’s All Good.” I wrote it while on vacation in late June and early July, and then it took a week after my return to get it out. It reviewed the excesses that had occurred in the preceding few years and the extent to which people were overlooking them, thinking instead that everything was ideal and would stay that way. It discussed the recurring tendency of investors in bullish times to feel that “it’s different this time” – that the process which caused past cyclical highs to correct wouldn’t apply in the current instance. The bullish balloon remained unpunctured as of July 16, and some may have thought my memo unduly pessimistic. It’s a good thing it didn’t take another week or two to put it out, however, because by July 30, things had started to go bad, set off by defaults among subprime mortgages and downgrades of securities based on them. “An isolated development,” the bulls replied, as is usual when the first crack in the dam appears. It’s hard to believe that less than five months later, the effects are widespread, significant losses have been registered, and negativism has taken over from euphoria. No one doubts that we’re in the throes of a full-fledged credit crunch. But in that way, it truly is no different this time.

低收益市场中的投资者行为

Investor Behavior in a Low-Return Market

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每个玩家都必须接受命运发给自己的牌。但一旦牌到了手里,输赢如何打牌,就只能由他自己决定了。

上个月,我在澳大利亚墨尔本一家咖啡馆的墙上看到了这句话,据说出自伏尔泰之口。我立刻意识到它同样适用于金融市场。正如我过去多次指出的,我们绝不能忽视一个事实:必须面对现实的投资环境。这个环境既是自然现象的产物,也是无数“经济单元”——消费者、投资者、企业和国家——做出决策的结果。环境摆在我们面前,任何单个人都无法改变它。重要的是我们如何应对它。

要成为成功的投资者,我们必须认清环境的本来面目,并据此行动。在任何特定的环境中,有些行为会带来成功,有些则会导致失败。哪种行为奏效、哪种行为失效,会随时间的推移发生巨大变化。作为投资者,我们的首要任务是评估环境,并规划出一条与之相适应的路线。

Each player must accept the cards life deals him or her. But once they are in hand, he or she alone must decide how to play the cards in order to win the game. I found that quote on the wall of a Melbourne, Australia coffee shop last month, with an attribution to Voltaire. I was struck immediately by its applicability to the financial markets. As I’ve pointed out in the past, we must never overlook the need to deal with the investment environment as it is. The environment is the product of natural phenomena as well as the decisions made by millions of “economic units” such as consumers, investors, companies and nations. We are presented with it, and no one of us can alter it. What matters is what we do with it. To succeed as investors, we must recognize the environment for what it is and act accordingly. In any given environment, some actions will lead to success and others to failure. Which is which varies greatly over time. Our first task as investors is to assess the environment and map a course which is appropriate for it.

2007 年橡树资本管理有限合伙公司

2007 Oaktree Capital Management, L.P.

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正如我在几年前所指出的(参见 2004 年 10 月《今日的风险与回报》),我们生活在一个低回报的世界。传统安全投资所提供的预期回报,从绝对水平看,低得可怜。沿着风险曲线往外走,预期回报的增加也微乎其微;也就是说,风险溢价在许多情况下处于历史低位。总体而言,资本市场线——风险/回报曲线——又“低又平”。总之,承担风险所获得的回报少得可怜。

那么,在那个低回报的世界里,投资者该怎么办?你可以照常投资,接受低于以往习惯的回报,也许决定长期配置资本,忽略短期波动。你也可以拒绝投资,转而持有现金,尽管这样做的预期回报始终是最低的。或者——我想大多数人正是这么做的——你可以拒绝常规投资提供的低回报,去追求更高的收益。也就是说,你可以坚持要在低回报的世界里实现高回报。但坚持是一回事,让投资组合真正拿到手又是另一回事。后者该如何实现?

答案很简单:许多人伸手去够回报。这主要意味着进行风险更高的投资,或使用杠杆来增加风险资本(或两者兼而有之)。这就是过去几年的大致故事,也是今天市场陷入困境背后的原因。

As I noted a few years ago, (see “Risk and Return Today,” October 2004) we were living in a low-return world. The prospective returns offered on traditionally safe investments were low in the absolute. Moving out on the risk curve added little to expected returns; i.e., risk premiums were in many cases at record lows. Overall, then, the Capital Market Line – the risk/return curve – was “low and flat.” In all, the rewards offered for risk bearing were paltry. So what was an investor to do in that low-return world? You could make your usual investments and accept returns below those you’re used to, perhaps deciding to allocate your capital for the long term and ignore the short term. Or you could decline to invest and hold cash instead, despite the fact that the expected return for doing so is invariably the lowest. Or – as I think most people did – you could reject the low returns available on your usual investments and go for more. That is, you could insist on achieving high returns in a low-return world. But insisting on them is one thing, and positioning your portfolio to get them is another. How might the latter be accomplished? The answer is simple: many reached for return. Primarily that meant making riskier investments or using leverage to increase the capital at risk (or both). That’s the main story of the last few years, and the reason behind the jam the markets are in today.

那么,到底发生了什么?

So What Happened?

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正如我在《今天的风险与回报》一文中所写,近年来投资者做了他们以前从未做过——或没做那么多——的事情,因为他们不满足于高等级债券能给的 4% 到 5%,以及他们觉得美股能给的 6% 到 7% 的回报。比如,他们把钱更多投进对冲基金,这些资金承诺在短短一两年内就把最大的并购基金从 30 亿到 50 亿美元撑大到 200 亿美元以上。投资者屈服于杠杆的诱惑。他们借入廉价的短期资金——期限越短越便宜(只要你愿意抵押资产并承诺按月还款,就能借到便宜的钱)。他们用这些钱去买那些因流动性差和/或基本面风险而提供更高回报的资产。世界各地的机构投资者纷纷接受华尔街最新的“银弹”承诺——两种据说能以低风险带来高回报的工具:证券化和结构化产品。

表面上,这些投资说得通。它们承诺了令人满意的绝对回报,因为杠杆买入的回报足以覆盖资金成本。只要不出什么岔子,结果会很美妙……

但照例,逐利之心引发错误。预期回报看着不错,但可能结果的区间里藏着一些非常糟糕的情形。很多投资的成功

As I wrote in “Risk and Return Today,” in recent years investors did things they’d never done before – or hadn’t done as much of – because they wanted more than the 4-5% they could get in high grade bonds and the 6-7% they felt they could expect from U.S. equities. They put more into hedge funds, for example, and their commitments expanded the largest buyout funds from $3-5 billion to $20 billion-plus in just a year or two. Investors succumbed to the siren song of leverage. They borrowed cheap short-term funds – the shorter the cheaper (you can get money cheap if you’re willing to pledge assets and promise repayment monthly). And they used that money to buy assets that offered higher returns because they entailed illiquidity and/or fundamental risk. And institutional investors all over the world took Wall Street up on the newest promises of two “silver bullets” that would provide high returns with low risk: securitization and structure. On the surface, these investments made sense. They promised satisfactory absolute returns, as the returns on the leveraged purchases would more than pay the cost of capital. The results would be great . . . as long as nothing untoward happened. But, as usual, the pursuit of profit led to mistakes. The expected returns looked good, but the range of possible outcomes included some very nasty ones. The success of many

2007 年橡树资本管理有限合伙公司

2007 Oaktree Capital Management, L.P.

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当时所依赖的各种技术与架构,都建立在未来会延续过去模式的前提之上。而许多被寄予厚望的“现代奇迹”,其实并未经过实践的检验。

techniques and structures depended on the future looking like the past. And many of the “modern miracles” that were relied on were untested.

怀疑精神的匮乏

A Dearth of Skepticism

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与市场底部投资者过度怀疑不同,在上涨行情中,大多数人相信太多、担忧太少,缺乏足够的质疑精神。既然所有投资者都想捡便宜——而且看到身边人赚钱如此轻松——他们便倾向于跟风而上。他们希望好时光一直持续,而不是通过质疑现状来给这场狂欢泼冷水。

人人都梦想轻松致富——不冒风险就获得高回报。华尔街总能想出稳赚不赔的方案,吸引满怀希望的人们蜂拥而至,比如 1980 年代的组合保险和 1990 年代的互联网 IPO。到了近十年,投资者又深信证券化抵押贷款和高杠杆实体提供了神奇解法。那些早就不信圣诞老人的人也跳了进来,如今他们大失所望。但过往的教训从不会阻止新一代梦想家去追逐下一个银弹。

过去几年,人们相信了一些如今已被戳穿的神话。让我们回顾几个:

Unlike market bottoms, where investors are too skeptical, during upswings most people believe too much, worry too little and fail to apply enough skepticism. Since all investors want a good deal – and see the people around them making money so easily – they tend to jump aboard. They want to see the good times roll on, not to pour cold water on the party by questioning what’s going on. Everyone dreams of easy riches – of high returns earned without risk. Wall Street comes up with surefire solutions to which the hopeful flock, such as portfolio insurance in the 1980s and dot-com IPOs in the 1990s. In the current decade, investors became convinced that securitized mortgages and highly leveraged entities offered the magic solution. People who long ago stopped believing in Santa Claus jumped aboard, and now they’re disappointed. But past results never deter new generations of dreamers from chasing the next silver bullet. In the last few years, people accepted myths that now have been exposed. Let’s review a few: 

2006-07 年间,我们频繁听到一种论调,称去中介化降低了风险。由于放贷银行通过银团贷款将贷款转移至其他银行及非银行放贷机构,任何一家银行——乃至整个金融体系——所承担的风险都得以减轻。当然,这种世界变得更安全的感受,促使许多参与者承担了比平时更多的风险。而我们看到的最大亏损出现在哪里?恰恰是那些被认为更安全的银行。

In 2006-07, we heard a lot of talk to the effect that disintermediation had reduced risk. Because lending banks were moving loans off their books through syndication to other banks and non-bank lenders alike, the risk residing at any one bank – and thus in the financial system as a whole – had been reduced. Of course, the feeling that the world had become a safer place led many participants to take on more risk than they otherwise would. And where are we seeing the biggest losses reported? At those supposedly safer banks.

许多人因为过度依赖信用评级而蒙受了损失。比如,投资者怎么会带着如此巨大的亏损出现在抵押贷款相关债务抵押债券(CDO)上?原因在于,他们没有接受 AA 级公司债券的低收益率,而是选择了 CDO 中同样被评为 AA 级的层级……因为这些层级提供了更高的收益率。但且慢!同样的质量,却能得到更高的收益?免费的午餐?这不太可能。也许买家过于依赖评级,而忽略了自身的尽职调查。也许信用评级机构并未完全理解所审查的债务,或者存在偏见,导致评级过高。也许他们无意让 CDO 债务的 AA 评级与公司债务的 AA 评级含义相同。也许评级机构的分析师缺乏在投资界创造价值所需的超越平均水平的技能;如果他们具备这些技能,难道不会把时间花在更赚钱的投资上吗?

A lot of people have lost money as a result of excessive reliance on credit ratings. How is it, for example, that investors are showing up with such large losses on mortgage-related CDO debt? Well, rather than accept the low yields on AA-rated corporate bonds, they went for the AA-rated tranches from CDOs . . . because they offered higher yields. But wait a minute! More yield for the same quality? A free lunch? Not likely. Maybe the buyers relied too much on ratings in lieu of their own due diligence. Maybe the credit rating agencies didn’t fully understand the debt under review, or had biases which led to too-high ratings. Maybe they didn’t intend the AA rating on CDO debt to mean the same thing as an AA rating on corporate debt. And maybe the rating-agency analysts lacked the above-average skills that are needed to add value in the investment world; if they possessed them, wouldn’t they be spending their time more lucratively as investors?

也许最能说明问题的是,人们似乎愿意不问“谁在买单”就痛快畅饮。以担保债务凭证(CDO)的创造过程为例:作为……

Perhaps most telling, it seems people were willing to drink up without asking, “Who’s paying the tab?” Take the CDO creation process: Acting on behalf of a

2007 年橡树资本管理有限合伙公司

2007 Oaktree Capital Management, L.P.

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一家按揭公司,一位按揭经纪发放了一笔贷款。按揭公司把这笔贷款卖给了一家投行。投行把它打包成住房抵押贷款支持证券,再卖给一个 CDO 发起方。发起方通过向机构投资者发行债务筹集资金,把它打包成 CDO。债务的销售由配售代理或投行促成。我数了数,每一笔按揭贷款从发放、证券化到分销,至少有五方从中收钱。有人在支付大笔费用。即便最初的按揭贷款定价合理,到了最后 CDO 债务还能定价公允吗?华尔街的回答很简单:整个流程可能费用沉重,但每一档单独来看都很有吸引力。嗯?没几个人去审视那层层费用,问一句这些交易是否扛得住养活这么多中间人。在 2003 至 2007 年间,他们觉得没这个必要。怀疑精神的普遍缺失在两方面意义重大。就个体而言,每一次缺失都代表一种因考虑不周的投资而亏钱的方式;就整体而言,它们反映了市场的氛围。在上行过热的时期,童话故事大行其道,助长冒险行为。然后它们被戳穿,正如今天正在发生的那样。或者用沃伦·巴菲特的话说:“潮水退去,才知道谁在裸泳。”这一回,答案是“很多人”。

mortgage company, a mortgage broker made a loan. The mortgage company sold the loan to an investment bank. The investment bank packaged it into a residential mortgage-backed security and sold it to a CDO originator. The originator packaged it into a CDO, having raised the money for the CDO through sales of debt to institutional investors. The sale of the debt was facilitated by a placement agent or investment bank. I count at least five parties who got paid each time a mortgage loan was placed, securitized and distributed. Someone was paying a lot of fees. Even if the original mortgage loan was priced reasonably at the beginning, is it possible the CDO debt was fairly priced at the end? Wall Street’s answer is simple: The overall process may have been heavily laden with fees, but the individual tranches were attractive. Huh? Few people looked at the multiple fees and asked if the deals could withstand paying so many middlemen. In 2003-07, they didn’t feel the need. Widespread failings of skepticism are significant in two ways. Individually, each one represents a way to lose money through an ill-considered investment. And collectively, they’re indicative of the market climate. In times of excess on the upside, fairy tales gain currency and encourage risk taking. And then they are debunked, as is happening today. Or as Warren Buffett puts it, “when the tide goes out, we find out who’s been swimming without a bathing suit.” This time around, the answer is “lots of people.”

杠杆的魔力

显而易见,这次许多投资者栽跟头的关键因素是廉价且易得的信贷,在使用时几乎没意识到风险。过剩的资本寻找非传统投资出路,导致大量资金以低息优惠利率涌入抵押贷款,贷给了常常无需证明收入的低信用购房者。这让对冲基金大举进行套息交易,让收购基金有底气出价买下世界级公司,背负足够杠杆以追求高预期回报。这也是支撑担保贷款凭证(CLO)、债务抵押债券(CDO)、CDO 平方、导管工具、结构性投资工具(SIV)及其他高杠杆实体的基石。美联储出于最充分的理由提供廉价信贷:应对新兴市场危机、9·11 事件、科技泡沫破裂、大萧条以来首次连续三年股市下跌、千年虫问题、电信业崩溃、通缩担忧以及其心头上的其他种种。利率处于大多数人前所未见的低水平,现金收益率只有 1%,以此为锚。低利率一方面压低了风险曲线安全端投资的回报,另一方面为高风险冒险行为提供了燃料。

绝不能忘记,杠杆不会让投资变得更好,只会放大盈亏。由于大多数投资具有正期望值,即平均来看预期盈利,杠杆便显得提升了预期回报。而且大多数时候,确实运转良好。

但偶尔会出岔子。也许资产价格涨得太高,难以支撑。也许投资背后的分析被证明有缺陷。

The Magic of Leverage It’s obvious that the key element in many of the errors that tripped up investors this time around was cheap and easy credit, utilized without much awareness of risk. An oversupply of capital looking for a home in non-traditional investments caused vast sums to be pushed into mortgage loans at low-cost teaser rates to un-creditworthy homebuyers who often weren’t required to document their incomes. It let hedge funds bulk up on the carry trade and buyout funds bid enough to acquire world-class companies, taking on enough leverage to target high expected returns. And it was the building block supporting CLOs, CDOs, CDO2s, conduits, SIVs and other highly leveraged entities. The Fed delivered cheap credit for the best of reasons: to counter the depressing effects of the emerging market crisis, 9/11, the tech bubble bust, the first three-year stock market decline since the Depression, Y2K, the telecom meltdown, concern about deflation, and whatever else was on its mind. Interest rates were the lowest most of us had ever seen, anchored by 1% on cash. The low rates both (a) drove down returns on investments at the safe end of the risk curve and (b) provided the fuel for elevated risk taking. One must never forget that leverage doesn’t make investments better; it just magnifies the gains and losses. Since most investments have a positive expected value, meaning that gains are expected on average, leverage has the effect of appearing to enhance the expected return. And most of the time, that works just fine. But once in a while, something goes awry. Maybe asset prices go so high they become unsupportable. Maybe the analysis behind an investment proves to have been faulty.

2007 年橡树资本管理有限合伙公司

2007 Oaktree Capital Management, L.P.

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也许某个外部事件会拖累资产价格,或者让资金供给吃紧,或者两者同时恶化。也可能这些情况恰好一起发生。当小概率事件真的出现——资产价格意外下跌时——杠杆放大的冲击可能让人难以承受,进而引发一连串负面反应。

资产价格下跌,放贷方开始不愿提供信贷,最终还会要求还款。信贷收紧后,还款可能只能靠卖资产来凑,这在本来就不景气的市场里又给价格添了向下压力。价格继续走低,信心进一步恶化,放贷方越发谨慎,信贷更加稀缺。原本的良性循环变成了恶性循环。信贷紧缩就是这么来的。

大多数投资者崩盘里都有一个反复出现的因素。被诱人的预期收益勾住,或者觉得不加杠杆的收益实在不够看,投资者借入短期资金去买长期资产。然后总有一天坏日子会来,短期资金流出(因为要应对还款要求、借款到期,或者投资者赎回)。而在那一天,可能(a)流出的资金补不上,(b)组合里的资产又卖不出合理价格。就算能卖,价格也可能低到把全部资产按这个价重估的话,这家机构的净资产就成负数了。就这么简单:崩盘。今年夏天贝尔斯登的高等级结构化信用策略增强杠杆基金就是这么倒的。1998 年的长期资本管理公司、1994 年的花岗岩基金也是如此。以后还会重演——因为金融记忆很短,而杠杆的诱惑很难抗拒。

投资者必须记住,一项投资光有不错的预期回报还不够,或者负面结果概率不大也还不够。杠杆有一个常被忽视的效应:它“加粗了尾部”——让两个方向的极端结果都更可能发生——同时放大了负面事件的后果。每一个投资组合或投资实体都必须检验一遍,确保能在那个坏日子活下来——也就是说,它的结构要让各项条款、借款和资产风险之间的相互作用不会把自己搞到内爆。当然,这又引出一个问题:我们应该为多糟糕的情形留余地。每个投资者的风险厌恶程度不同,这决定了组合该为多严重的负面发展做好扛住的准备。但这些问题确实必须想清楚。

我一想到有人用杠杆去从低回报投资里硬挤出像样的收益,就觉得这是犯傻。算笔账:你有 100 美元可投,碰到一个基本面扎实、收益 6% 的投资机会。但你嫌 6% 太低。于是你不买 100 美元的量,而是再借 400 美元(利息 5%),买 500 美元。如果借款成本 5%、投资回报 6%,那么每一倍杠杆就给你预期回报加 1%。所以除了自己 100 美元本金赚的 6 美元,你每借 100 美元还能多赚 1 美元,借 400 美元就是 4 美元。这样算下来,你的 100 美元本金在四倍杠杆下总回报是 10 美元。瞧!那个不咋地的 6% 变成了体面的 10%。

Maybe an exogenous event negatively influences asset prices or funding availability or both. And maybe they all happen at once. When the unlikely occurs – when asset prices decline unexpectedly – the impact as magnified by leverage can be unbearable, setting off a negative chain reaction. Falling asset prices cause lenders to shy away from providing credit, and eventually to demand repayment. With credit less available, repayment might have to come from asset sales, putting additional downward pressure on prices in an already unaccommodating market. Prices go down further; confidence worsens; lenders grow more cautious; and credit becomes even less available. What used to be a virtuous circle becomes a vicious circle. This is how credit crunches occur. There is a recurring element in most investor meltdowns. Lured by attractive promised returns or spurred on by the perceived inadequacy of unleveraged returns, investors borrow short-term capital with which to buy long-term assets. And then eventually there comes a bad day, on which the short-term capital flows out (in response to demands for repayment, the maturing of borrowings, or investor withdrawals). And on that particular day, perhaps (a) the outgoing capital can’t be replaced and (b) portfolio assets can’t be sold at fair prices. Sales, if feasible, may have to be made at prices so low that, if all the assets were marked there, the entity’s net worth would be negative. That’s it: meltdown. That’s what happened this summer to Bear Stearns’s High-Grade Structured Credit Strategies Enhanced Leveraged Fund. It happened to Long-Term Capital Management in 1998 and to the Granite Fund in 1994. And it’ll happen again – because financial memory is short and the attraction of leverage can be irresistible. Investors must remember that it’s not enough that an investment has a good expected return, or that the negative outcomes are unlikely. One of the overlooked effects of leverage is that it “fattens the tails” – increases the likelihood of extreme outcomes in both directions – and worsens the consequences of negative events. Every portfolio or investing entity must be examined to make sure it will be able to survive that bad day – that it has been set up so the interaction of its terms, its borrowings and the riskiness of its assets won’t cause it to implode. Of course, this leads to the question of how negative a set of circumstances we should allow for. Each investor’s degree of risk averseness will determine what level of negative developments a portfolio should be built to withstand. But certainly these are topics that must be considered. When I think about investors using leverage to try to wring acceptable results from lowreturn investments, it seems like folly. Let’s see: You have $100 to invest, and you come across a fundamentally sound investment that yields 6%. But you consider the 6% return too low. So rather than buy $100 worth, you borrow another $400 at 5% interest and buy $500 worth. If you can borrow at 5% and invest at 6%, each “turn” of leverage adds 1% to your expected return. Thus, in addition to the $6 earned on your own $100 of capital, you’ll earn an additional $1 per $100 of borrowed capital, or $4 on $400. Thus the total return on your $100 of capital, leveraged four times, is $10. Voila! That inadequate 6% return has been turned into a handsome 10%.

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且慢。回想一下,你最初觉得 6% 的投资回报率太低。当所有人都开始认同它应该更高时,会发生什么?通常,投资预期回报上升的途径是价格下跌。于是,靠着杠杆,你买入了五倍于原计划的资产,而这资产本身回报欠佳,又注定要跌价。这让我想起朋友桑迪,他最爱的餐厅点评是“菜难吃得要命,但分量足得很。”放到这儿,就成了“回报远远不够,但多亏了杠杆,你能买上一大堆。”这算好事吗?

But wait a minute. Remember, you originally thought the 6% return on the investment was too low. What happens when everyone comes to agree that it should be higher? Well, the normal way for an investment’s prospective return to go up is for its price to fall. So now, with help from leverage, you’ve bought five times as much of an asset that’s under-returning and due for a price decline. It all reminds me of my friend Sandy, whose favorite restaurant review is “the food’s terrible, but the portions are huge.” In this case, it’s “the return’s inadequate, but thanks to leverage you can buy a lot.” Is that a good thing?

垃圾进,垃圾出。

Garbage In, Garbage Out

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这句话在 10 到 20 年前广泛流传,但最近我很少听到了。它的意思很简单:如果模型和决策过程从一开始就没有有效输入,就不可能产生好的决策。粗略地说,我认为计算机目前只能做的是维护和搜索数据库,将一样东西与另一样比较,并执行计算。它们还不能思考(至少目前如此)。

我认为这对财务决策者的重要性在于,尽管计算机能够发现、验证并外推过去一直存在的关系,但它们无法判断这些关系何时会失效,以及什么新关系会取而代之。

换句话说,计算机对过去了解很多,但对未来知之甚少。要让计算机——或者那些缺乏远见的人——知道将来会发生什么,它们需要有关过去的可靠数据,并预期未来会像过去一样。2007 年,人们在这两方面都大失所望。

大多数人听说过“风险价值”(VAR),这是一种对投资组合单日损失潜力的最坏情况估计。《经济学人》11 月 1 日报道称,在第三季度的交易日内(占全部交易日四分之一),瑞银在至少 16 个交易日的交易损失超过了前一天计算的 VAR。而在瑞银自 1998 年开始使用 VAR 以来的所有年份中,没有一天出现过这种情况。问题出在哪里?也许 VAR 并不是一个好的衡量标准;也许瑞银使用的数据有误;也许模型基于的时期不具代表性或太短而不具统计显著性;又或许世界变了,使模型失效。

This expression was in broad circulation 10-20 years ago, but I haven’t heard it much lately. It’s meaning is simple: models and decision-making processes can’t produce good decisions if they don’t begin from valid inputs. Roughly stated, I think all computers can do is maintain and search data bases, compare one thing against another, and perform calculations. They cannot think (yet). I think the importance of this for financial decision makers is that while computers can find, verify and extrapolate relationships that have held in the past, they can’t tell when those relationships will cease to work and what new relationships will take their place. Put another way, computers know a lot about the past but much less about the future. In order for computers – or people lacking foresight, for that matter – to know what will happen in the future, they need reliable data regarding the past and an ability to expect that the future will be like the past. People were let down in both regards in 2007. Most people have heard of “value at risk,” or VAR, a worst-case estimate of a portfolio’s one-day loss potential. The Economist reported on November 1 that on no fewer than 16 trading days in the third quarter (a quarter of all the days), UBS’s trading losses exceeded the VAR calculated the preceding day. In all the preceding years since UBS began to use VAR in 1998, there hadn’t been one such day . What went wrong? Maybe VAR isn’t a good measure. Maybe the data UBS used was erroneous. Maybe the model was based on a period that was atypical or too short to be statistically significant. Or maybe the world changed, invalidating the model. T

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近几年来,金融炼金术催生了一大批由低等级抵押贷款池包装而成的高评级证券。投资者信赖这些评级,我猜评级机构也依赖那些在过往经验看来颇为合理的违约率假设。但他们未曾考虑到境况的变化(例如,抵押贷款发起者不再长期自担风险,因此他们的放贷决策方式已与以往大相径庭)。正是出于这类原因,假设最终可能被证明是不合时宜的。

In the last few years, financial alchemy led to the creation of large numbers of high-rated securities out of pools of low-grade mortgages. Investors relied on the ratings, and I suppose the rating agencies relied on default rate assumptions that looked reasonable in the light of experience. But they didn’t allow for changed circumstances (e.g., for the fact that since mortgage initiators no longer risked their own money for long, they had stopped making lending decisions the way they used to). It’s for reasons like this that assumptions can turn out to be inappropriate.

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我不是说输入的数据是垃圾时,你就没法投资赚钱。但只有在批判性地评估了假设的可靠性之后,才能通过要求适当的风险溢价,把足够的风险缓冲考虑进去。过去几年里,人们买入那些“安全”的证券,其实根本不了解它们的运作机制或根基。结果现在清清楚楚。

I’m not saying you can’t invest profitably when the inputs are garbage. But only after critically assessing the reliability of assumptions can sufficient allowance for risk be built in via demands for an appropriate risk premium. In the last few years, people bought “safe” securities where they really had little understanding of their workings or foundations. The results are now clear.

I’m Shocked …Shocked

I’m Shocked . . . Shocked

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市场上涨往往伴随着怀疑不足,因此过高的期望落空并不罕见。《华尔街日报》11 月 2 日一篇关于花旗业绩的报道用了“不安”和“慌乱”这样的字眼。像今天我们所见的这种幻灭感,对投资者心理的腐蚀性鲜有匹敌。

我记得 1991 年前后《华尔街日报》上有一篇文章让我忍俊不禁。一位共同基金投资者在高收益债券上损失惨重后,接受采访时说:“我以为我投的是高收益债券基金。早知道是垃圾债券基金,我绝不会买。”投资者在缺乏充分认知的情况下行事,愿望落空时便感觉被背叛,这很常见。这次他们在说:“它被评为 3A 级,现在却没人告诉我它值多少钱。”

幻灭来得又快又猛(别提有多吓人了)。如今多数担保债务凭证(CDO)投资者想必已经明白,他们当初对运作机制和所承担的风险一无所知。持有者眼睁睁看着投资级债券在一次评级行动中被直接下调到单 C 级。贝尔斯登旗下“高等级结构化信贷策略增强杠杆基金”的投资者血本无归,那些动听的形容词没带来任何保护。一些资产在合理价格下根本卖不出去。大量资产支持商业票据无法续期。原本预计 50 亿美元的减记,几周之内就成了 80 亿美元的实际减记。

瑞银首席执行官马塞尔·罗纳上周说“我们次贷持仓的最终价值……仍无从知晓”,这番话似乎代表了这一时期的心声。我对此毫不怀疑,也正是因为这个原因,他的表态让我想起 2005 年的一份备忘录,题为《请先给我后见之明(或者:他们当时在想什么?)》。为什么投资者事先就看不出来这些投资的结果是不可预测的?是什么让他们做出了如今被这样描述的投资?这着实让我纳闷,他们当时到底在想什么。

Given that market upswings are often accompanied by insufficient skepticism, it’s not unusual for lofty expectations to be disappointed. A story on Citibank’s results in the Wall Street Journal of November 2 contained words such as “unnerved” and “unsettled.” Few things have a more corrosive effect on investor psychology than disillusionment like we’re seeing today. I remember getting a kick out of an article that ran in the Wall Street Journal around 1991. After taking big losses in high yield bonds, a mutual fund investor was quoted as saying, “I thought I was investing in a high yield bond fund. If I’d known it was a junk bond fund, I never would’ve bought it.” It’s common for investors to act without adequate understanding, and for them to feel betrayed when their hopes are unfulfilled. This time they’re saying, “It was rated triple-A, and now no one can tell me what it’s worth.” The disillusionment has been swift and dramatic (not to mention terrifying). Most CDO investors must now realize they had no idea how the mechanisms would work or how much risk they were taking. Holders have seen investment grade debt downgraded to single-C in a single rating action. Investors in Bear Stearns’s High-Grade Structured Credit Strategies Enhanced Leveraged Fund lost all their money, finding no protection in all those great adjectives. Some assets became unsalable at any reasonable price. A lot of asset-backed commercial paper became unrenewable. And $5 billion anticipated writedowns turned into $8 billion actual writedowns in just a few weeks. In a statement that seems representative of this period, Marcel Rohner, the Chief Executive of UBS, said last week the “ultimate value of our subprime holdings . . . remains unknowable.” I don’t doubt that it is, and for that reason his statement calls to mind a 2005 memo titled “Hindsight First, Please (or, What Were They Thinking?).” Why couldn’t investors figure out in advance that the result of these investments were unpredictable? What caused them to make investments that now are described that way? It truly makes me wonder what they were thinking.

管理风险的挑战

The Challenge of Managing Risk

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投资者信心遭受重创的原因之一,很简单,就是此前的信心实在太高了(这是市场达到不可持续的高位所必需的)。而其中大部分

One of the reasons investor confidence has been hit so hard is simply that it was too high (as is required for unsustainable market highs to be reached). And much of

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投资者们的过度安心,恰恰集中在风险领域,人们普遍相信一切尽在掌控之中。但事实是,风险很难管理。

正如我在《风险》(2006 年 2 月)一文中所言,投资风险在很大程度上是隐形的——在事前,除非拥有非凡洞察力的人,否则几乎无人能察觉,甚至在一项投资退出之后亦然。正因如此,我们所见过的许多重大金融灾难,都是未能预见和管理风险的结果。这背后有几个原因。

  1. 风险只存在于未来,而未来究竟如何,无人能确知。正如彼得·伯恩斯坦所言,“风险意味着可能发生的事情,比实际发生的事情更多……”回望过去时,一切似乎毫无悬念,只有已发生的事情发生了。但这种确定性并不意味着产生结果的过程就是清晰且可靠的。过去每一种情形下,本有许多事情可能发生,而实际只发生了一件,这一事实恰恰低估了当时存在的变数。我想表达的是(受纳西姆·尼古拉斯·塔勒布的《随机漫步的傻瓜》启发):已然发生的历史,只是无数可能版本中的一个。如果你接受这一点,那么历史对未来的参考意义,就远没有表面看起来的那么重要。
  2. 是否承担风险的决策,是在预期正常模式会重现的基础上做出的,而大多数时候也确实如此。但偶尔,会有截然不同的事情发生。正如我的朋友(也是技艺高超的投资者)里克·凯恩所言,“金融历史的大部分都发生在两个标准差之内,但一切有趣的事情都发生在两个标准差之外。”2007 年发生的就是这种情况。去年夏天,我们总听到“那是五个标准差的事件”或“那是十个西格玛的事件”,言下之意是这种事本该每一百年、一千年乃至一万年才发生一次。那么,正如 8 月所声称的那样,怎么可能在短短一周内就发生好几起这样的事件呢?答案是,它们发生的不可能性被高估了。
  3. 预测往往围绕历史常态聚集,并且只预期微小变化。关键在于,人们通常期望未来会像过去一样,从而低估了发生变化的可能性。1996 年 8 月,我写过一份备忘录,指出在《华尔街日报》每半年一次的经济学家调查中,平均而言,预测都是对当前状况的简单外推。当我年轻时作为分析师跟踪泰克斯特龙公司,基于其四大业务集团的预测来构建盈利估算时,我总发现自己既低估了正面惊喜的程度,也低估了不及预期的程度。
  4. 我们常听到“最坏情况”的预测,但结果往往证明这些预测还不够悲观。预测者真正指的是“糟糕情况预测”。我讲一个我父亲讲过的事:有个赌徒总是输钱,一天他听说一场赛马只有一匹马参赛,于是他把房租钱押了上去。马跑到半圈时,跳过栅栏跑掉了。事情总会比人们预期的更糟。也许“最坏情况”指的是“我们过去见过的最糟情形”。但那

investors’ excessive comfort was in the area of risk, where it was roundly believed things were under control. But the truth is, it’s hard to manage risk. As I stated in “Risk” (February 2006), investment risk is largely invisible – before the fact, except perhaps to people with unusual insight, and even after an investment has been exited. For this reason, many of the great financial disasters we’ve seen have been failures to foresee and manage risk. There are several reasons for this. 1. Risk exists only in the future, and it’s impossible to know for sure what the future holds. Or as Peter Bernstein puts it, “Risk means more things can happen than will happen . . .” No ambiguity is evident when we view the past. Only the things that happened happened. But that definiteness doesn’t mean the process that creates outcomes is clear-cut and dependable. Many things could have happened in each case in the past, and the fact that only one did happen understates the variability that existed. What I mean to say (inspired by Nicolas Nassim Taleb’s Fooled by Randomness) is that the history that took place is only one version of what it could have been. If you accept this, then the relevance of history to the future is much more limited than may appear to be the case. 2. Decisions whether or not to bear risk are made in contemplation of normal patterns recurring, and they do most of the time. But once in a while, something very different happens. Or as my friend (and highly skilled investor) Ric Kayne puts it, “Most of financial history has taken place within two standard deviations, but everything interesting has occurred outside of two standard deviations.” That’s what happened in 2007. We heard all the time this past summer, “that was a 5-standard deviation event,” or “that was a 10-sigma event,” implying it should have happened only once every hundred or thousand or ten thousand years. So how could several such events have happened in a single week, as was claimed in August? The answer is that the improbability of their happening had been overestimated. 3. Projections tend to cluster around historic norms and call for only small changes. The point is, people usually expect the future to be like the past and underestimate the potential for change. In August 1996, I wrote a memo showing that in the Wall Street Journal’s semi-annual poll of economists, on average the predictions are an extrapolation of the current condition. And when I was a young analyst following Textron, building my earnings estimates based on projections for its four major groups, I invariably found that I had underestimated the extent of both the positive surprises and the shortfalls. 4. We hear a lot about “worst-case” projections, but they often turn out not to be negative enough. What forecasters mean is “bad-case projections.” I tell my father’s story of the gambler who lost regularly. One day he heard about a race with only one horse in it, so he bet the rent money. Half way around the track, the horse jumped over the fence and ran away. Invariably things can get worse than people expect. Maybe “worst-case” means “the worst we’ve seen in the past.” But that

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这并不意味着未来情况不会更糟。2007 年,许多人的最坏假设就被打破了。

  1. 风险是集中爆发的。如果我们说每年“2% 的抵押贷款违约”,即使从多年平均值来看确实如此,但在某个时间点也可能出现异常的违约潮,从而击垮一个结构性融资工具。67 年前,本·格雷厄姆和戴维·多德这样说过:“……不同种类投资与损失风险之间的关系过于模糊,且随条件变化而波动太大,无法形成可靠的数学公式。尤其因为投资损失在时间上并非均匀分布,而是往往集中在某些时段……”(《证券分析》,1940 年版)。总有一些投资者——尤其是那些使用高杠杆的——会在这些时段中无法生存。
  2. 人们高估了自己评估风险和理解从未见过其运作机制的能力。理论上,人类与其他物种的一个区别在于,我们无需亲身经历就能判断某事物的危险性。我们不必被烫伤才知道不该坐在热炉子上。但在牛市时期,人们往往不会行使这种功能。他们不仅不提前识别风险,反而倾向于高估自己理解新金融发明运作方式的能力。
  3. 最后但很重要的一点是,大多数人把承担风险主要视为赚钱的手段。承担更高风险通常带来更高回报。市场必须把局面设计成看起来如此;否则人们就不会做风险投资。但事情不可能总是这样,否则风险投资就不会有风险。而当承担风险不起作用时,那真是彻底失灵,人们才会想起风险到底是什么。

大多数时候,承担风险的结果还不错。事实上,往往是承担最大风险的人赚到最多的钱。但也有时候,低估风险、承担过多风险会带来致命后果。承担的风险太少会让你落后于同行——但这总比在错误时机承担过多风险的后果强得多。从来没有人因为风险意识过强而破产。但风险意识的缺乏——以及由此导致的轻率投资——要对当前许多局面负上责任。

回顾教训——并无新意

市场是一间每天都在上课的教室。投资成功的关键在于观察和学习,这正是我自 40 年前在花旗银行得到第一份工作以来一直努力去做的事。

doesn’t mean things can’t be worse in the future. In 2007, many people’s worst-case assumptions were exceeded. 5. Risk shows up lumpily. If we say “2% of mortgages default” each year, and even if that’s true when we look at a multi-year average, an unusual spate of defaults can occur at a point in time, sinking a structured finance vehicle. Ben Graham and David Dodd put it this way 67 years ago: “. . .the relation between different kinds of investments and the risk of loss is entirely too indefinite, and too variable with changing conditions, to permit of sound mathematical formulation. This is particularly true because investment losses are not distributed fairly evenly in point of time, but tend to be concentrated at intervals . . .” (Security Analysis, 1940 Edition). It’s invariably the case that some investors – especially those who employ high leverage – will fail to survive at those intervals. 6. People overestimate their ability to gauge risk and understand mechanisms they’ve never before seen in operation. In theory, one thing that distinguishes humans from other species is that we can figure out that something’s dangerous without experiencing it. We don’t have to burn ourselves to know we shouldn’t sit on a hot stove. But in bullish times, people tend not to perform this function. Rather than recognize risk ahead, they tend to overestimate their ability to understand how new financial inventions will work. 7. Finally and importantly, most people view risk taking primarily as a way to make money. Bearing higher risk generally produces higher returns. The market has to set things up to look like that’ll be the case; if it didn’t, people wouldn’t make risky investments. But it can’t always work that way, or else risky investments wouldn’t be risky. And when risk bearing doesn’t work, it really doesn’t work, and people are reminded what risk’s all about. Most of the time, risk bearing works out just fine. In fact, it’s often the case that the people who take the most risk make the most money. However, there also are times when underestimating risk and accepting too much of it can be fatal. Taking too little risk can cause you to underperform your peers – but that beats the heck out of the consequences of taking too much risk at the wrong time. No one ever went bankrupt because of an excess of risk consciousness. But a shortage of it – and the imprudent investments it led to – bears responsibility for a lot of what’s going on now. Recapping the Lessons – Nothing New The markets are a classroom where lessons are taught every day. The keys to investment success lie in observing and learning, which is what I’ve tried to do in the 40 years since I got my first job at Citibank.

2007 年橡树资本管理有限合伙公司

2007 Oaktree Capital Management, L.P.

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我认为始于 2002 年左右的信贷周期,将会被记入史上最极端的周期之一,并在未来多年里成为人们讨论的话题。这是我所见证的最重要、潜在后果最严重的金融事件之一,也是一次绝佳的学习经历。(当然,人们常说“经验就是当你没有得到想要的东西时,所得到的东西。”)

今年夏天,金融市场仅仅因为抵押贷款市场某个偏远角落出现问题,就在几周内摇摆不定,令许多人措手不及。但所发生的一切本不该让人感到意外。虽然每次金融危机的细节看似新颖、各不相同,但其背后的主要主题往往相同,而当前这个周期里,其中几个主题再次重演。下面十二条教训,没有一条只针对 2007 年、次级抵押贷款或债务抵押债券(CDO)。每一条都是我之前在工作中亲眼见过的。

  1. 资本过于充裕,会让资金流向错误的地方。当资本稀缺且供不应求时,投资者面临资本最佳用途的配置选择,他们得以带着耐心和纪律做决策。但当资本过多,追逐过少的投资机会时,那些本不该进行的投资就会发生。
  2. 资本流向不该去的地方,坏事就会发生。在资本市场紧缩时期,合格的借款人被拒之门外。但当钱无处不在时,不合格的借款人也会被捧着银盘子送上资金。不可避免的结果就是违约、破产和亏损。
  3. 当资本供应过剩时,投资者会通过接受低回报和微薄的安全边际来竞争交易。当人们想买东西时,他们的竞争形式就像一场拍卖,出价越来越高。仔细想想,为某样东西出更高的价,就等于说你的钱愿意拿更少的回报。因此,对投资的出价可以看作投资者要求多低的回报、愿意承担多大风险的一种表态。
  4. 普遍无视风险,就会制造巨大的风险。“不可能出问题。”“什么价格都不算高。”“总会有人出更高的价钱从我手里买走。”“我要是不赶紧动手,别人就买走了。”诸如此类的话,表明风险正被草率对待。这一周期的版本是,人们认为因为他们买的是更好的公司,或者用对借款人更友好的债务来融资,收购交易就能支撑越来越高的杠杆。这让他们忽视了意外情况发生的风险,以及高杠杆资本结构本身固有的危险。
  5. 尽职调查不充分,就会导致投资亏损。防范亏损最可靠的防线,是彻底、有洞察力的分析,以及对沃伦·巴菲特所说的“安全边际”的坚持。但在火热的市场里,人们担心的是错过机会,而不是亏钱,费时又持怀疑态度的分析,就成了老古董们的专属领域。

I think the credit cycle that began around 2002 will go down as one of the most extreme on record and be the subject of discussion for years to come. It is one of the most important, potentially most serious financial episodes I’ve witnessed, and it presents a great learning experience. (Of course, it’s said that “experience is what you got when you didn’t get what you wanted.”) People were blindsided this summer when the financial markets went wobbly in just a few weeks on the basis of unhappiness in a remote corner of the mortgage market. But nothing that happened should have come as a surprise. While the details of each financial crisis may seem new and different, the major themes behind them are usually the same, and several were repeated in the current cycle. Not one of the following twelve lessons is specific to 2007 or to subprime mortgages or CDOs. And each one is something I’ve seen at work before. 1. Too much capital availability makes money flow to the wrong places. When capital is scarce and in demand, investors are faced with allocation choices regarding the best use for their capital, and they get to make their decisions with patience and discipline. But when there’s too much capital chasing too few ideas, investments will be made that do not deserve to be made. 2. When capital goes where it shouldn’t, bad things happen. In times of capital market stringency, deserving borrowers are turned away. But when money’s everywhere, unqualified borrowers are offered money on a silver platter. The inevitable results include delinquencies, bankruptcies and losses. 3. When capital is in oversupply, investors compete for deals by accepting low returns and a slender margin for error. When people want to buy something, their competition takes the form of an auction in which they bid higher and higher. When you think about it, bidding more for something is the same as saying you’ll take less for your money. Thus the bids for investments can be viewed as a statement of how little return investors demand and how much risk they’re willing to accept. 4. Widespread disregard for risk creates great risk. “Nothing can go wrong.” “No price is too high.” “Someone will always pay me more for it.” “If I don’t move quickly, someone else will buy it.” Statements like these indicate that risk is being given short shrift. This cycle’s version saw people think that because they were buying better companies or financing with more borrower-friendly debt, buyout transactions could support larger and larger amounts of leverage. This caused them to ignore the risk of untoward developments and the danger inherent in highly leveraged capital structures. 5. Inadequate due diligence leads to investment losses. The best defense against loss is thorough, insightful analysis and insistence on what Warren Buffett calls “margin for error.” But in hot markets, people worry about missing out, not about losing money, and time-consuming, skeptical analysis becomes the province of old fogeys.

2007 年橡树资本管理有限合伙公司

2007 Oaktree Capital Management, L.P.

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  1. 在狂热的时期,资本会涌向创新投资,其中许多经不起时间的考验。看涨的投资者关注的是可能成功之处,而非可能出错之处。急切取代了审慎,让人们接受了不懂的新投资产品。事后,他们才疑惑自己当时究竟是怎么想的。
  2. 潜伏在投资组合中的隐秘裂缝,可能让看似无关的资产价格同涨同跌。评估一项投资的回报和风险,比理解它与其他资产的相对联动更容易。相关性常常被低估,尤其是在危机中其程度会加剧。投资组合可能在资产类别、行业和地域上显得分散,但在艰难时期,追加保证金、市场冻结和整体风险厌恶情绪上升等非基本面因素可能占据主导,使所有资产受到相似的影响。
  3. 心理和技术因素可能压倒基本面。长期来看,价值创造和毁灭由经济趋势、公司盈利、产品需求以及管理层的能力等基本面因素驱动。但在短期内,市场对投资者心理以及影响资产供需的技术因素高度敏感。事实上,我认为短期内信心比什么都重要。这方面任何事情都可能发生,结果既不可预测,也非理性。
  4. 市场会变化,模型因此失效。关于“量化”基金困境的叙述,核心在于计算机模型及其底层假设的失败。管理投资组合的计算机主要试图从过去市场中成立的模式中获利。它们无法预测这些模式的变化,无法预知异常时期,因此往往会高估历史常态的可靠性。
  5. 杠杆放大结果,但不增加价值。在资产价格低廉、提供高预期回报或丰厚风险溢价时,用杠杆增加投资可能很有道理。但用杠杆买入回报低或风险利差窄的资产——即定价充分或过高的资产——则可能很危险。用杠杆试图把不足的回报变成像样的回报,几乎没什么意义。
  6. 过度终会修正。当投资者心理极度乐观,市场“按完美定价”——基于一切永远美好的假设——资本毁灭的场景就已埋下。这可能是因为投资者的假设过于乐观,也可能是负面事件发生,或者仅仅是过高的价格自身崩塌。
  7. 投资生存必须在短期内实现,而不是长期的平均水平。这就是为什么我们绝不能忘记那个六英尺高的人,却淹死在平均深度五英尺的小溪里。投资者必须挺过低谷。因为在不利条件下确保这种能力,是……

6. In heady times, capital is devoted to innovative investments, many of which fail the test of time. Bullish investors focus on what might work, not what might go wrong. Eagerness takes over from prudence, causing people to accept new investment products they don’t understand. Later, they wonder what they could have been thinking. 7. Hidden fault lines running through portfolios can make the prices of seemingly unrelated assets move in tandem. It’s easier to assess the return and risk of an investment than to understand how it will move relative to others. Correlation is often underestimated, especially because of the degree to which it increases in crisis. A portfolio may appear to be diversified as to asset class, industry and geography, but in tough times, non-fundamental factors such as margin calls, frozen markets and a general rise in risk aversion can become dominant, affecting everything similarly. 8. Psychological and technical factors can swamp fundamentals. In the long run, value creation and destruction are driven by fundamentals such as economic trends, companies’ earnings, demand for products and the skillfulness of managements. But in the short run, markets are highly responsive to investor psychology and the technical factors that influence the supply and demand for assets. In fact, I think confidence matters more than anything else in the short run. Anything can happen in this regard, with results that are both unpredictable and irrational. 9. Markets change, invalidating models. Accounts of the difficulties of “quant” funds center on the failure of computer models and their underlying assumptions. The computers that run portfolios primarily attempt to profit from patterns that held true in past markets. They can’t predict changes in those patterns; they can’t anticipate aberrant periods; and thus they generally overestimate the reliability of past norms. 10. Leverage magnifies outcomes but doesn’t add value. It can make great sense to use leverage to increase your investment in assets at bargain prices offering high promised returns or generous risk premiums. But it can be dangerous to use leverage to buy more of assets that offer low returns or narrow risk spreads – in other words, assets that are fully priced or overpriced. It makes little sense to use leverage to try to turn inadequate returns into adequate returns. 11. Excesses correct. When investor psychology is extremely rosy and markets are “priced for perfection” – based on an assumption that things will always be good – the scene is set for capital destruction. It may happen because investors’ assumptions turn out to be too optimistic, because negative events occur, or simply because toohigh prices collapse of their own weight. 12. Investment survival has to be achieved in the short run, not on average over the long run. That’s why we must never forget the six-foot-tall man who drowned crossing the stream that was five feet deep on average. Investors have to make it through the low points. Because ensuring the ability to do so under adverse

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2007 Oaktree Capital Management, L.P.

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这种情形与在好年景下追求回报最大化是矛盾的,投资者必须在两者之间做出抉择。

上述十二条准则,绝大多数可归结为一条:时刻警觉周遭资金供需的失衡,以及人们花钱的急切程度。我们清楚资金匮乏、人人惜贷是什么滋味(比如当下)。有价值的投资项目可能无人问津,整个经济的商业活动都会放缓,这叫做信贷紧缩。但相反的情形同样值得警惕。它没有正式的名字,或许“钱太多,好主意太少”这个说法还算贴切。不管叫什么,资本过剩加上随之而来的谨慎缺失——就像我们在过去几年看到的那样——会带来恶劣后果,对投资者的健康构成威胁,必须认清并加以应对。

以上列举的所有规则最终都会生效……但很少按你的时间表来。正因为如此,随着市场越发走向极端,越来越多的人会在越来越糟糕的时点加入到看多阵营。不过请记住,正如拉里·萨默斯所言:“在经济领域,事情的发生总是比你预期的要慢,但一旦真正发生,又比你想象的来得更快。”这些正是当前危机背后的主题。掌握了这些,你就有更大的机会避开下一场危机。

circumstances is incompatible with maximizing returns in the good times, investors must choose between the two. Most of these twelve lessons can be reduced to just one: be alert to what’s going on around you with regard to the supply/demand balance for investable funds and the eagerness to spend them. We know what it feels like when there’s too little capital around and great hesitance to part with it (like now). Worthwhile investments can go begging, and business can slow throughout the economy. It’s called a credit crunch. But the opposite deserves to receive no less attention. There’s no official term for it, so “too much money chasing too few ideas” may have to do. Regardless of what it’s called, an oversupply of capital and the accompanying dearth of prudence such as we saw in the last few years – with their pernicious effects – can be dangerous for your investing health and must be recognized and dealt with. All of the rules enumerated above can be depended on to take effect . . . eventually. But rarely do they operate on schedule. That’s why, as markets go further to excess, more and more people join in bullish behavior at worse and worse moments. Remember, though, as Larry Summers put it, “in economics things happen slower than you expected they would, but when they finally do, they happen faster than you imagined they could.” These are the themes behind the current crisis. Master them and you’ll have a better chance of side-stepping the next one.

December 17, 2007

December 17, 2007

2007 年橡树资本管理有限合伙

2007 Oaktree Capital Management, L.P.

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