The Loan Inside The Portfolio

A margin account is a loan with your portfolio as collateral, and it comes with the friendliest paperwork in finance. Since 1974 the Federal Reserve’s Regulation T has set the standard at 50% down — buy $100,000 of stock with $50,000 of your own money. (In 1929 the standard was closer to 10% down, which is a load-bearing fact about 1929.) After purchase, a maintenance requirement takes over: fall below the line and the broker issues the famous call — add cash, or we sell your positions. Today. Our pick of the fine print, though, is a different clause: the broker may raise the maintenance requirement whenever it likes, and in practice does exactly that — on volatile single stocks, in the middle of the storm, precisely when everyone’s collateral is worth less.

Follow the sequence, because it’s the whole letter. The market falls. Your collateral shrinks, so the loan grows relative to it — automatically, with no action from you. The call arrives at the bottom, demanding cash you’d have to raise by selling into that bottom. The margin loan converts a drawdown — a temporary, survivable, even buyable event — into a realized sale at the low. An unleveraged investor watching the same market has an unrealized bad month. A leveraged one has a transaction, timed by a risk computer, executed by someone whose job is protecting the lender.

The modern retail version arrives dressed better. Wirehouses now market securities-backed lines of credit — borrow against the portfolio for the kitchen remodel, the tax bill, the boat, without “disrupting your investments.” It’s the margin loan with a concierge. The collateral math is identical, the call provisions are identical, and the sequence above runs identically in a bad year — except now the forced sale also funds a boat.

The leveraged ETF looks like the safe way in: double or triple the index, no margin account, no call, maximum loss capped at what you invested. All true. What the brochure underplays sits in four words on page one — “of the daily return.” These funds reset their leverage every single day, and that reset changes the mathematics from what any reasonable person would assume they bought.

Run that two-day pattern for a volatile sideways year and the damage compounds quietly: the index finishes flat, and the leveraged holder finishes meaningfully down, having been mathematically correct about direction the entire time. Volatility itself is a cost when leverage resets daily — the industry calls it volatility drag, and it’s why these products are built, and explicitly documented, as single-day trading instruments rather than investments. The prospectus says so. The holding periods in the wild say nobody reads the prospectus.

In a smooth trending year the reset works in the holder’s favor, which is precisely what makes the products durable: every long rally mints a cohort of investors whose 2× fund delivered more than 2× and who conclude the fine print was lawyer noise. The chop that follows collects from that cohort. Same road, both directions, and the toll booth only photographs you on the way down.

The counterargument writes itself: surely leverage is fine in professional hands. The professionals have twice provided the definitive rebuttal, a generation apart, and the two stories are worth owning because every future version will rhyme with one of them.

Long-Term Capital Management, 1998. Two Nobel laureates on the letterhead, the best arbitrage traders of their era, and positions that were — this is the painful part — substantially correct. The fund ran leverage north of 25-to-1 on trades that profited when unusual price gaps closed. Russia defaulted, the gaps widened further instead, and at 25-to-1 a widening gap is a margin call. The trades eventually converged exactly as the models predicted; the fund wasn’t alive to collect. It took a Federal Reserve–brokered rescue by fourteen banks to unwind the book without taking the banking system with it. Being right eventually is worthless when the loan is due now — the epitaph of every leveraged blowup since.

Archegos, 2021. A family office running one man’s money built five-to-one exposure to a handful of stocks through total-return swaps — leverage arranged so that no single bank could see the whole stack. One position broke, the collateral calls cascaded, and the fire sale destroyed more than $10 billion of the banks’ capital in roughly a week — Credit Suisse alone ate $5.5 billion, a wound that contributed to there no longer being a Credit Suisse. The stocks were ordinary, liquid, listed companies. The portfolio was never the danger. The stack was.

Which returns us, deliberately, to the humblest loan in American life. A fixed-rate mortgage is enormous leverage — five-to-one at a standard down payment — on a single illiquid asset. We like it anyway, and the reasons are exactly the clauses the disasters lacked: it’s non-callable (the house price can halve and no one can demand the balance), it amortizes (the leverage falls automatically every month), and the payment was fixed on day one. The 2008 borrowers who kept paying kept the house; the margin borrower gets no equivalent option. It’s the one loan in this letter engineered so that being right eventually is enough.