Nearly every issue so far has been about buying excellent businesses and holding them. This one is the complement: four strategies whose returns come not from corporate growth but from structural mispricing and forced behavior. For most people the conclusion will still be "don't participate" — but understanding them answers a more fundamental question: when I buy, who is the person selling to me, and why do they have to sell?
The Principle
A short's maximum gain is 100%; its maximum loss has no ceiling. The position shrinks automatically when you are right and swells when you are wrong — the exact reverse of being long. You must be correct on direction and timing at once, and timing is not yours to set.
Origin · Quote
"Markets can remain irrational longer than you can remain solvent."
— Widely attributed to J. M. Keynes, but the line appears nowhere in his writings or letters; the earliest traceable source is the economist A. Gary Shilling, Forbes, February 1993
A Deeper Reading
The misattribution is itself the warning: widely repeated is not the same as verified. Shorting carries three asymmetries. The odds are inverted (capped at 100%, uncapped below). Position feedback is positive: being right shrinks the position and makes compounding hard, while being wrong inflates it and reinforces the risk. Holding costs money: borrow fees, dividends paid away, recall of the borrow at any moment — and equities drift up over time. "Expensive" is never a reason to short; you need a catalyst and a timetable.
The Case
In November 2000, Jim Chanos's Kynikos began shorting Enron on evidence drawn entirely from public filings: a return on capital of only 6%–7%, below its cost of capital, plus gain-on-sale revenue recognition and extensive related-party transactions. Enron filed for bankruptcy on December 2, 2001; in February 2002 Chanos laid out the same reasoning in testimony to the U.S. House of Representatives.
The reverse: on October 26, 2008, Porsche disclosed holdings of 42.6% of Volkswagen plus 31.5% in cash-settled options — roughly 74% — with Lower Saxony holding another 20.1%. That left under 6% genuinely tradable, against short interest of about 12%. Two days later the shares ran from roughly €210 to above €1,000. The shorts' valuation judgment was not wrong; the other side was simply able to squeeze them out first.
Limits · Decision Checklist
In the January 2021 squeeze, Melvin Capital lost about 53% in a single month and wound down the following year despite a $2.75 billion injection. The deeper point: even Chanos closed his outside fund business in November 2023, on the grounds that standalone short selling had become unsustainable as a business. Shorting is excellent research training and rarely a good position.
- Does my thesis have a catalyst and a time window, or only "it's too expensive"?
- What share of the float is short? What is the annualized borrow rate? Can the borrow be recalled?
- If the price doubles first, can I avoid a forced close and live to see the thesis play out?
The Essence · A Question to Sit With
The difficulty of shorting is not being wrong; it is that being right can still get you destroyed first.
Pick the company you most want to short and give three reasons it could rise 50% within three months. If you cannot, you have an opinion but no risk model.
The Principle
Return = spread × probability of completion − the break loss × probability of failure. The distribution is left-skewed: small gains most of the time, a large loss occasionally — the shape of writing default insurance, not of investing in a business.
Origin · Quote
"We have to answer four questions: (1) How likely is it that the promised event will indeed occur? (2) How long will your money be tied up? (3) What chance is there that something still better will transpire — a competing takeover bid, for example? and (4) What will happen if the event does not take place because of anti-trust action, financing glitches, etc.?"
— Warren Buffett, Berkshire Hathaway 1988 Chairman's Letter
A Deeper Reading
Everything turns on the fourth question: the first three determine your return, the fourth determines whether you survive. The spread is not a discount; it is the market's quoted price for the probability of failure. An annualized 4% spread implies that better than nine-in-ten completion odds are already priced, and the remaining tenth takes 20%–30% in one stroke. In the same letter Buffett notes that Graham-Newman's arbitrage returned roughly 20% a year over three decades — in an era when arbitrageurs were scarce.
Deal closes (roughly nine times in ten)
+3%
Blocked by regulators (roughly one in ten)
−25%
The expected value can be positive, but the shape governs the outcome: years of small gains do not immunize one oversized position.
The Case
Microsoft's acquisition of Activision Blizzard was announced in January 2022 at $95 per share in cash. The FTC sued that December and the UK's CMA blocked it in April 2023; the shares fell to about $71, a discount of roughly 25%. The deal closed in October 2023 — still at $95. One transaction, opposite outcomes for holders with different horizons and different leverage.
The other side: in April 2016 the U.S. Treasury abruptly issued new rules on corporate inversions, and the roughly $160 billion Pfizer–Allergan merger was terminated within two days. The rule change came without warning and sat in no model.
Limits · Decision Checklist
The antitrust environment is an institutional variable, not a probability constant: the FTC/DOJ and the UK's CMA visibly tightened their posture in 2021–2023, and the prior decade's break rates were worthless as guidance for that stretch. An individual also carries three disadvantages: no institutional funding cost, no ability to spread across dozens of concurrent deals, and no sight of what law firms judge about the approval path — and those three are the moat of the entire business.
- Am I measuring the annualized spread or the absolute one? What remains after tax and funding costs?
- What is the "naked" price on a break (pre-announcement price × sector move since)? How many such losses can I absorb?
- Is the main risk the shareholder vote, financing, or antitrust? The last cannot be estimated from historical odds.
The Essence · A Question to Sit With
Merger arbitrage pays like a coupon and risks like insurance; price insurance with a coupon mindset and the claim eventually arrives.
If you have ever added to a position because "it's only a few points from closing" — that is the same move as an insurer expanding coverage during hurricane season.
The Principle
What you buy in bankruptcy is not the business but your position in the capital structure. Recovery is decided by priority of claims and by which layer the fulcrum security lands on — almost independently of whether the company is any "good."
Origin · Quote
"Risk means more things can happen than will happen."
— Elroy Dimson, quoted by Howard Marks in The Most Important Thing (2011) as the foundation of his view of risk
A Deeper Reading
The absolute priority rule sets the waterfall: secured debt → unsecured debt → preferred stock → common stock, with each layer entitled to nothing in principle until the one above is paid in full. The fulcrum security is the layer the line happens to cut through, and after reorganization it typically converts into equity in the new company. So the work has two steps: estimate the reorganized value of the enterprise, then see which rung of the waterfall that number lands on. It also explains why old common stock so often spikes on a bankruptcy filing — most of the buyers do not know they are standing at the bottom.
The Case
General Motors filed for Chapter 11 in June 2009. Secured lenders were paid in full; holders of roughly $27 billion of unsecured bonds received equity and warrants in the new company worth about thirty cents on the dollar initially; the old common stock went to zero. It is also a case of absolute priority being broken — the UAW retiree healthcare trust (VEBA) was treated better than some pari passu unsecured creditors. Priority is the legal starting point; the outcome is settled by negotiation.
The other side: in the week Lehman failed, Howard Marks of Oaktree began buying distressed debt in size, deploying roughly $6 billion over the following fifteen weeks. His reasoning was not that he had called the bottom, but that prices already embedded a collapse of the system — and if that actually happened, nothing anyone did would matter.
Limits · Decision Checklist
Unsecured creditors of Lehman Brothers Holdings ultimately recovered far more than early estimates suggested — but the liquidation ran for more than a decade: the recovery rate was right and the annualized return still poor. The more practical limit is access rather than difficulty: corporate bonds often trade in $100,000 minimums, court filings and creditors' committees create structural information gaps, and legal and advisory fees only make sense at scale.
- How many billions of senior claims sit above the layer I am buying?
- Where is the fulcrum security? Am I above it (cash or new debt) or below it (likely zero)?
- If the reorganization takes three years, what is left of my annualized return?
The Essence · A Question to Sit With
In bankruptcy, whether the company is good hardly matters; what matters is where you stand in the queue.
Look at any highly leveraged company you own: if it entered reorganization tomorrow, where would your layer rank? If you cannot answer, what you hold is a junior option you have never priced.
The Principle
The opportunity in a spin-off does not come from the new company being better. It comes from a crowd of sellers who do not care about price: index funds bound by inclusion rules and institutions bound by mandate, dumping the small-cap shares just distributed to them.
Origin · Quote
"The spinoff process itself is a fundamentally inefficient method of distributing stock to the wrong people."
— Joel Greenblatt, You Can Be a Stock Market Genius (1997)
A Deeper Reading
There are three observable sources of excess return. Forced selling: spin-off shares are distributed pro rata to parent shareholders, many of whom (broad index funds, large-cap-only institutions) cannot or will not hold them. An information vacuum: no analyst coverage and no standalone financial history. Reset incentives: management receives equity tied directly to its own business for the first time. Greenblatt cites a Penn State study finding that over the twenty-five years to 1988, spun-off companies beat the market by roughly 10 percentage points a year in their first three years.
The Case
The 1993 Marriott split is the canonical example: the asset-light, cash-generative hotel management business went into Marriott International, while the real estate and the bulk of the debt stayed with Host Marriott. Existing bondholders sued — their claims had been left on the weaker side of the assets. The dispute is precisely the lesson: the first purpose of a spin-off is often to redistribute debt and risk, not to release value. Whoever takes the debt is the side that may be mispriced.
Today the mechanism is fully anticipated: GE split into three companies across 2023–2024 and Johnson & Johnson spun off Kenvue in 2023, both studied broadly months in advance. Mechanically buying spin-offs is no longer a free lunch.
Limits · Decision Checklist
This is the textbook case of anomaly decay. McLean and Pontiff (2016, Journal of Finance) examined 97 published return predictors and found that returns fell by roughly 58% on average after publication; an effect written into a bestseller decays faster still. The other face is just as common: parents use spin-offs to hand off declining businesses, pension liabilities, or litigation — you think you have bought a neglected pearl and have in fact taken delivery of what was being discarded.
- Which side received the debt, pension, and litigation liabilities? What is the spun-off entity's net debt/EBITDA?
- Which side did the core management team go to? What metric does their new equity award track?
- Is my reason "structural selling pressure" or "this is a good business"? The second requires an entirely different analysis.
The Essence · A Question to Sit With
The excess return in a spin-off comes from forced sellers; once everyone knows who has to sell, it is gone.
Think back to your last purchase: can you say who the seller was and why they sold? If not, you do not know where your edge came from.
Going Deeper
Are short sellers a pest or an immune system?
The evidence favors the latter. Wirecard's problems were flagged by journalists and short sellers before 2019, and Germany's regulator BaFin responded in February 2019 by temporarily banning short sales of the stock and investigating the reporters; in June 2020 the company admitted that some €1.9 billion did not exist. Abuse is equally real — build the position first, then circulate unverified material. The dividing line is not whether shorting is permitted, but whether truthfulness is held to the same standard in both directions.
Why does the excess return in every one of these strategies decay?
Three forces work at once: capital floods in and compresses spreads (the same mechanism as the capital cycle in Day 58); publication itself kills returns; and capacity is bounded — the supply of opportunities is set by corporate behavior and does not grow because more money wants in. Decay does not mean disappearance; it means the window only reopens briefly at extremes.
AI can read every bankruptcy filing and merger announcement — has it killed these opportunities?
Information processing was never the binding constraint. These returns are compensation for bearing illiquidity, legal process, and time, not for reading quickly. AI will rapidly erase the advantage of reading fast and computing thoroughly: post-announcement spreads will compress sooner and spin-off mispricing windows will close faster. What it cannot erase is the willingness to hold for three years through panic without being redeemed. The remaining excess return will concentrate in what cannot be arbitraged structurally — duration, liquidity, and tolerance for pain.
Should a long-term investor participate at all?
Most should not: each of these four is a business with full-time practitioners and legal resources, and the other side of your trade is not a retail investor. But understanding them changes three decisions in your main portfolio. First, know who is on the other side — whether the seller is forced (index reconstitution, spin-off distribution, redemptions) or willing determines whether "cheap" is real. Second, know your position in the capital structure, which matters most when buying leveraged companies. Third, decompose "cheap": how much is undervaluation and how much is only an illiquidity discount.