债务的影响
Memo to:
Memo to:
Oaktree Clients
Oaktree Clients
From:
From:
Howard Marks
Howard Marks
Re:
Re:
债务的影响
The Impact of Debt
我的合伙人布鲁斯·卡什最近给我看了一篇关于国际象棋的报纸文章,这篇文章启发我写了一份简短的备忘录,题为《风险不可或缺》。备忘录的反响不错,但愿是因为内容有料,但也有可能是它只有三页长,不像平时那样十到十二页。受此鼓舞,我接着再写一份短备忘录。
我在实用哲学——包括投资哲学——方面一个比较有意思的阅读来源,是 Collaborative Fund 的博客,该基金合伙人摩根·豪斯尔是常驻撰稿人。读豪斯尔的随笔时,我经常暗自感叹“这跟我的想法完全一致。”有时候我也会说,正如我希望别人读完我的备忘录后所说,“我还真没这么想过。”
我觉得豪斯尔 4 月 30 日那篇《我是如何看待债务的》特别有意思。主题是债务对长寿的影响,说到底讨论的是风险——我最喜欢的话题之一。
豪斯尔先谈到日本有 140 家企业在创立 500 多年后仍在经营,还有少数几家据称已存续超过 1000 年。
想想这些企业经历过什么,实在令人震惊——几十场战争、多位天皇、灾难性地震、海啸、大萧条,层出不穷,没完没了。而它们却一代接一代地卖着东西。
这些超长寿企业被称为“老铺”(shinise),对它们的研究显示,它们往往有一个共同特征:持有大量现金,不欠债务。这正是它们能在数百年间不断遭遇灾难却屹立不倒的部分原因。
显然,在其他条件相同的情况下,负债的人和企业比不负债的更容易陷入困境。不言而喻,一套没拿去抵押贷款的房子或一辆没用于贷款担保的车,不可能被取消赎回权或被收回。正是债务的存在,才制造了违约、止赎和破产的可能性。
那是不是说债务是坏东西,应该避而远之?绝非如此。问题在于,债务的量相对于(a)整体企业的规模,(b)企业盈利能力和资产价值的潜在波动,是否恰当。
豪斯尔引入“一生中潜在波动”这个概念来框定问题:“不只是市场波动,还有……世界和生活的波动:衰退、战争、离婚、疾病、搬家、洪水、变心,等等。”他假设,没有债务的话,除了最罕见、最剧烈的波动事件,我们几乎什么都能扛过去。但豪斯尔用一连串例子说明:随着负债水平上升,能承受的波动范围逐渐收窄,到债务高得离谱时,只有最风平浪静的环境才活得下去。豪斯尔总结道:“债务越多,你能扛得住的人生结局就越窄。”
My partner Bruce Karsh recently supplied me with a newspaper article about chess that inspired me to write a brief memo called The Indispensability of Risk. The response to the memo was favorable, hopefully because people found the content valuable, but quite possibly because it was only three pages long versus the usual ten to twelve. Thus encouraged, I’m following up with another short memo. One of my more interesting sources for readings on practical philosophy – including investment philosophy – is the blog from the Collaborative Fund to which Morgan Housel, a fund partner, is a regular contributor. As I read Housel’s musings, I often find myself saying, “that’s right in line with what I think.” And at other times, I say, as I hope others say after reading my memos, “I never thought of it that way.” I found Housel’s April 30 article, entitled “How I Think About Debt,” particularly interesting. The subject is the impact of debt on longevity, and it really boils down to a discussion of risk, one of my favorite topics. Housel starts by discussing the 140 businesses in Japan that are still operating more than 500 years after they were founded and the few that are purportedly more than 1,000 years old. It’s astounding to think what these businesses have endured – dozens of wars, emperors, catastrophic earthquakes, tsunamis, depressions, on and on, endlessly. And yet they keep selling, generation after generation. These ultra-durable businesses are called “shinise,” and studies of them show they tend to share a common characteristic: they hold tons of cash, and no debt. That’s part of how they endure centuries of constant calamities. Clearly, all else being equal, people and companies that are indebted are more likely to run into trouble than those that aren’t. And it goes without saying that a home or car that hasn’t been used as collateral for a loan can’t be foreclosed on or repossessed. It’s the presence of debt that creates the possibility of default, foreclosure, and bankruptcy. Does that mean debt is a bad thing and should be avoided? Absolutely not. Rather, it’s a matter of whether the amount of debt is appropriate relative to (a) the size of the overall enterprise and (b) the potential for fluctuations in the enterprise’s profitability and asset value. Housel frames the issue by introducing the idea of potential volatility over one’s lifetime: “Not just market volatility, but . . . world and life volatility: recessions, wars, divorces, illness, moves, floods, changes of heart, etc.” With no debt, he postulates, we’re likely to survive all but the most infrequent, most volatile events. But in a succession of illustrations, Housel shows that as the level of one’s indebtedness increases, the range of volatility one can withstand narrows, until at a very high level of debt, only the tamest of environments are survivable. As Housel puts it, “as debt increases, you narrow the range of outcomes you can endure in life.”
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豪塞尔思考债务的方式——尤其是他的举例——让我想起了自己 2008 年 12 月的备忘录《波动性加杠杆等于炸药》。(除非另有说明,本文引文均出自该备忘录;所有强调均为原文所加。)在那份备忘录里,我用一系列简单的图表说明:一家公司的债务负担越低,它能承受的命运逆转幅度就越大。我还对当时正肆虐的全球金融危机的根源做了如下观察:
……借用资金——即杠杆——的审慎程度,纯粹取决于所购资产的风险性和波动性。资产越稳定,可安全使用的杠杆就越多。风险越高的资产,杠杆就越少。就这么简单。
当前金融机构问题的一大主因是,它们低估了住房抵押贷款等资产固有的风险,结果用过多的借入资金买入了过多的抵押贷款支持证券。
投资组合、杠杆与波动性
举债的原因——也就是投资者所说的“杠杆”——很简单:为了提高所谓的资本效率。债务资本通常相对于激励股权投资的预期回报而言较为便宜,因此相对于股权的隐含成本也更低。所以,用它替代股权是高效的。在赌场里,我听过赌台经理说:“你下注越多,赢的时候赢的就越多。”同样,在既定股权资本下,(a)你使用的债务资本越多,能拥有的资产就越多;(b)你拥有的资产越多,利润就越大……前提是事情顺风顺水的时候。
但很少有人谈论不利的一面。赌台经理从不说:“……你输的时候输的也越多。”同样,当你的资产贬值时,你使用的杠杆越多,股权损失就越大。
杠杆放大收益和损失的效果通常是对称的:一定量的杠杆会类似地放大收益和损失。但杠杆化投资组合面临一个没有对应上行空间的下行风险:灭顶之灾的风险。关于杠杆最重要的格言提醒我们:“永远别忘了那个身高六英尺的人,在平均深度五英尺的溪流里淹死了。”要生存,你必须挺过低谷,而你背负的杠杆越多(在其他条件相同的情况下),你挺过去的可能性就越小。
……认识到波动性的作用很重要。即使损失不是永久性的,如果投资组合高度杠杆化,且(a)贷款人可能切断信贷,(b)投资者可能因恐慌而撤回股权,或(c)违反监管或合同标准可能触发强制抛售,那么一次下行波动就可能带来灭顶之灾。
显然,当下行波动的潜力在相当长一段时间内被低估,杠杆的使用因此变得过度时,与杠杆相关的最大损失就会发生。一般来说,“正常水平的波动性”——即那些经常出现并被历史统计数据记录的波动——会被纳入投资者的计算中,并反映在他们使用的杠杆量上。正是那些孤立的“尾部事件”给杠杆投资者带来了最大的损失:
Housel’s approach to thinking about debt – and especially his illustrations – reminded me of my December 2008 memo, Volatility + Leverage = Dynamite. (Unless otherwise indicated, this memo is the source of the quotations that follow; in all cases, emphasis is in the original.) In that memo, I used a series of simple graphics to show that the lower a company’s debt load is, the greater the decline in fortune it could survive. And I made the following observation about the root cause of the Global Financial Crisis, which was in full force at the time of the memo: . . . the amount of borrowed money – leverage – that it’s prudent to use is purely a function of the riskiness and volatility of the assets it’s used to purchase. The more stable the assets, the more leverage it’s safe to use. Riskier assets, less leverage. It’s that simple. One of the main reasons for the problem today at financial institutions is that they underestimated the risk inherent in assets such as home mortgages and, as a result, bought too much mortgage-backed paper with too much borrowed money. Portfolios, Leverage, and Volatility The reason for taking on debt – i.e., using what investors call “leverage” – is simple: to increase so-called capital efficiency. Debt capital is usually cheap relative to the expected returns that motivate equity investments and thus relative to the imputed cost of equity capital. Thus, it’s efficient to use it in lieu of equity. In casinos, I’ve heard the pit boss say, “The more you bet, the more you win when you win.” Likewise, for a given amount of equity capital, (a) the more debt capital you use, the more assets you can own and (b) the more assets you own, the greater your profits will be . . . when things go well. But few people talk about the downside. The pit boss never says, “. . . and the more you lose when you lose.” Likewise, when your assets decline in value, the more leverage you’ve employed, the more equity loss you’ll suffer. The magnification of gains and losses stemming from leverage is typically symmetrical: a given amount of leverage amplifies gains and losses similarly. But levered portfolios face a downside risk to which there isn’t a corresponding upside: the risk of ruin. The most important adage regarding leverage reminds us to “never forget the six-foot-tall person who drowned crossing the stream that was five feet deep on average.” To survive, you have to get through the low points, and the more leverage you carry (everything else being equal), the less likely you are to do so. . . . it’s important to recognize the role of volatility. Even if losses aren’t permanent, a downward fluctuation can bring risk of ruin if a portfolio is highly leveraged and (a) the lenders can cut off credit, (b) investors can be frightened into withdrawing their equity, or (c) the violation of regulatory or contractual standards can trigger forced selling. Obviously, the greatest leverage-related losses occur when the potential for downward fluctuations has been underestimated for a meaningful period of time and thus the use of leverage has become excessive. Generally speaking, “normal levels of volatility” – those seen on a regular basis and documented through historical statistics – are used in investors’ calculations and reflected in the amounts of leverage they employ. It’s the isolated “tail events” that saddle levered investors with the greatest losses:
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问题在于极端波动和损失只是偶尔才会显现。而随着时间推移,这种事一直没发生,人们就越来越觉得它永远不会发生——当初对风险的假设过于保守了。于是,放松规则、加大杠杆变得颇具诱惑力。而往往就在这个时候,风险终于露出了头。正如纳西姆·尼古拉斯·塔勒布在《随机漫步的傻瓜》中所写:
现实比俄罗斯轮盘赌要恶毒得多。首先,它发射致命子弹的频率很低,就像一把左轮手枪有几百个甚至几千个弹膛,而不是六个。试了几十次之后,在一种麻痹大意的虚假安全感下,人们就忘了子弹的存在……其次,与俄罗斯轮盘赌那种规则明确、风险对任何会乘除六的人都一目了然的精确游戏不同,人们看不到现实的枪膛……于是,人可能在不知不觉中玩起了俄罗斯轮盘赌——还给它起了个别的什么“低风险”的名字。
……在我们生活的方方面面,我们都基于自己认为可能发生的事来做决定。而反过来,这种判断又在很大程度上基于过去通常发生的事。我们预期大多数时候结果会接近常态,但我们也知道,出现更好或更糟的结果并不罕见。尽管我们应当牢记,偶尔会有结果超出通常范围,但我们往往忘记了极端值出现的可能性。而且重要的是,正如最近发生的事件所表明的,我们很少考虑那些一个世纪才发生一次……或者从未发生过的结果。
杠杆使用的周期
在我的第二本书《掌握市场周期:让胜算站在你这边》中,有一章是我最初动笔时没打算写的,却是最长、也可能是最重要的一章:“对风险的态度之周期”。投资者心理在短期内对市场有着主导性影响,而驱动投资决策的态度往往带有周期性,把市场推向非理性的极端,然后又朝相反方向修正……直到另一个极端。支配债务资本使用的态度就是这种周期过程的例子。当事情顺利了一阵子——资产价格上涨、投资回报为正、杠杆的使用以更高收益的形式得到了回报——投资者就会把杠杆视为良性的东西。于是:
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The problem is that extreme volatility and loss surface only infrequently. And as time passes without that happening, it appears more and more likely that it’ll never happen – that assumptions regarding risk were too conservative. Thus, it becomes tempting to relax rules and increase leverage. And often this is done just before the risk finally rears its head. As Nassim Nicholas Taleb wrote in Fooled by Randomness: Reality is far more vicious than Russian roulette. First, it delivers the fatal bullet rather infrequently, like a revolver that would have hundreds, even thousands of chambers instead of six. After a few dozen tries, one forgets about the existence of a bullet, under a numbing false sense of security . . . Second, unlike a well-defined precise game like Russian roulette, where the risks are visible to anyone capable of multiplying and dividing by six, one does not observe the barrel of reality. . . . One is thus capable of unwittingly playing Russian roulette – and calling it by some alternative “low risk” name. . . . In all aspects of our lives, we base our decisions on what we think probably will happen. And, in turn, we base that to a great extent on what usually happened in the past. We expect results to be close to the norm most of the time, but we know it’s not unusual to see outcomes that are better or worse. Although we should bear in mind that, once in a while, a result will be outside the usual range, we tend to forget about the potential for outliers. And importantly, as illustrated by recent events, we rarely consider outcomes that have happened only once a century . . . or never. Cycles in the Use of Leverage In my second book, Mastering the Market Cycle: Getting the Odds on Your Side, one of the longest chapters, and probably the most important, is one I hadn’t planned when I first sat down to write: “The Cycle in Attitudes Toward Risk.” Investor psychology has a dominant influence on the market in the short run, and the attitudes that motivate investment decisions are often cyclical in nature, driving markets to irrational extremes and then correcting in the opposite direction . . . to the opposite extreme. Attitudes that govern the use of debt capital are examples of this cyclical process. When things have been going well for a while – asset prices have been rising, investment returns have been positive, and the use of leverage has paid off in the form of higher returns – investors view leverage as benign. As a result: • • • • •
杠杆的好处在众人眼中日益清晰,其潜在的弊端却被忽视,投资者愈发渴望加大杠杆的使用,放贷方也乐得提供更多资金,而规范杠杆使用的法规与惯例也趋向宽松。
the favorable aspects of leverage become well-recognized, the negative potential is overlooked, investors become interested in employing more, lenders become willing to provide more, and regulations and mores governing the use of leverage tend to become more permissive.
但当形势转向不利时,这一过程便会逆转。杠杆不再受到奖励,而是受到惩罚。因此,它的使用量下降。重要的是,贷方会减少放贷,并在可能的情况下要求偿还未偿还的杠杆,从而给借款人带来负面后果。这样一来,正如我们屡见不鲜的那样,心理常常偏离“适度区间”,走向预示痛苦损失的高潮,而当极端低点到来时,损失便随之而来。过度使用杠杆造成的损失根源,或许最好通过我对爱德华·钱塞勒的著作《时间的价格》中一句我最喜欢的新引语的改编来理解,我在过去的一封信中曾引用过这句话。
But when events turn negative, this process goes into reverse. Leverage is penalized, not rewarded. Thus, its use declines. And importantly, lenders provide less and try to demand repayment of outstanding leverage if they can, leading to negative consequences for borrowers. In this way, as we so frequently see, psychology often strays from the “happy medium” and moves toward extreme highs that presage painful losses when extreme lows are reached. The source of losses from excessive use of leverage might be best understood through an adaptation of my favorite new quote, from Edward Chancellor’s book The Price of Time, which I cited in this past
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1 月备忘录《宽松货币》:曼彻斯特银行家约翰·米尔斯在 1865 年就曾敏锐地指出:“一般来说,恐慌不会摧毁资本;它只是揭示了资本早已被摧毁的程度——摧毁发生在好时光里过度加杠杆之时。”
审慎运用债务
与投资的诸多方面一样,确定合适的杠杆水平必须是一个优化问题,而非最大化问题。既然杠杆在盈利时放大收益,而投资者只有在预期盈利时才会投资,那就很容易让人以为合适的杠杆额度就是“能借多少借多少”。但如果你牢记两点——(a)杠杆在亏损时会放大损失,(b)极端负面情形下有归零的风险——投资者通常应该用得比最大可用额度少。成功的投资,或许在适度杠杆的加持下,通常能带来足够好的回报——这一点在好时光里很少有人想到。我在《波动性 + 杠杆 = 炸药》中是这样总结的:
显然,始终运用恰到好处的杠杆很困难,因为你很难确定自己是否对风险留足了余地。杠杆只应在经过验证的保守假设基础上使用。还应当指出,如果你在做的是新颖的、未经证实的、高风险、高波动的,或可能威胁身家性命的事,就不该追求收益最大化。相反,要宁可保守。生存的关键在于巴菲特一直念叨的东西:安全边际。动用资产所能支撑的全部杠杆,往往与坏结果出现时确保生存相抵触……底层资产风险越大,买入它们所用的杠杆就越少。在这方面保守假设会让你无法最大化收益,但在坏年景里可能救你的财务命。
思考债务的正确方式,或许最好用一条最古老的格言来概括:“有年迈的投资者,也有大胆的投资者,但没多少又年迈又大胆的投资者。”运用适度的借入资本,是在增强收益的欲望与对潜在负面后果的警觉之间取得平衡。只有这样,才有希望像摩根·豪泽尔笔下的长命百岁者那样,活得够久。
2024 年 5 月 8 日
January’s memo Easy Money: The Manchester Banker John Mills commented perceptively [in 1865] that “as a rule, panics do not destroy capital; they merely reveal the extent to which it has previously been destroyed by [the taking on of excessive leverage in good times].” Using Debt Prudently As with so many aspects of investing, determining the proper amount of leverage has to be a function of optimizing, not maximizing. Given that leverage magnifies gains when there are gains and that investors only invest when they expect there to be gains, it can be tempting to think the right amount of leverage is “all you can get.” But if you bear in mind (a) leverage’s potential to magnify losses when there are losses and (b) the risk of ruin under extreme negative circumstances, investors should usually use less than the maximum available. Successful investments, perhaps enhanced by the moderate use of leverage, should usually provide a good-enough return – something few people think about in good times. Here’s how I summed it up in Volatility + Leverage = Dynamite: Clearly, it’s difficult to always use the right amount of leverage, because it’s difficult to be sure you’re allowing sufficiently for risk. Leverage should only be used on the basis of demonstrably cautious assumptions. And it should be noted that if you’re doing something novel, unproven, risky, volatile, or potentially life-threatening, you shouldn’t seek to maximize returns. Instead, err on the side of caution. The key to survival lies in what Warren Buffett constantly harps on: margin of safety. Using 100% of the leverage one’s assets might justify is often incompatible with assuring survival when adverse outcomes materialize. . . . The riskier the underlying assets, the less leverage should be used to buy them. Conservative assumptions on this subject will keep you from maximizing gains but possibly save your financial life in bad times. The right way to think about debt may be best captured by one of the oldest maxims: “There are old investors, and there are bold investors, but there aren’t many old bold investors.” Using a moderate amount of borrowed capital balances the desire for enhanced gains against the awareness of the potential negative consequences. It’s only in this way that one can hope to attain the longevity of Morgan Housel’s 500-year-old success stories. May 8, 2024
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2024 Oaktree Capital Management, L.P.
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