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Black Monday 1987

The Week Before the Crash

Pomegra Learn

What Happened in the Days Before Black Monday?

The October 19, 1987 crash did not arrive from a clear sky. In the four trading days preceding it, the US equity market had already fallen roughly 9 percent — itself one of the most severe short-period declines in postwar history. Each day's decline triggered portfolio insurance sell programs; each day's selling left the market more vulnerable to the next day; and by the Friday close, sell orders were queued in a quantity that virtually guaranteed a severe Monday open regardless of any weekend news. Understanding the week before the crash is essential to understanding Black Monday itself.

The prelude: The market declines of October 14–16, 1987 — driven by rising interest rates, trade policy fears, and a deteriorating technical environment — set the portfolio insurance feedback mechanism in motion and left the market structurally primed for catastrophe.

Key Takeaways​

  • Four trading days before October 19, the Dow had already fallen approximately 9 percent, including a then-record 95-point decline on October 14.
  • Each day's decline triggered portfolio insurance models to calculate larger required hedges, queuing increasing volumes of futures-sell orders.
  • The trade deficit data released October 14 and the Gephardt amendment tariff threat were the proximate catalysts; rising 10-year Treasury yields (approaching 10 percent) were the background condition.
  • Friday October 16, "Bloody Friday," saw a 108-point Dow decline on heavy volume as institutional investors accelerated selling ahead of the weekend.
  • By Friday's close, portfolio insurance programs had queued an estimated $12 billion or more in futures-sell orders to execute at Monday's open.
  • The Saturday and Sunday that followed produced no positive developments — no policy announcements, no resolution of trade tensions — that might have absorbed the pre-queued selling.
  • Market professionals who understood the portfolio insurance dynamic knew by Friday afternoon that Monday would be difficult; what they underestimated was how difficult.

The Background Conditions​

By early October 1987, several macro developments had combined to create a fragile market environment. The 10-year Treasury yield had climbed from roughly 7.5 percent in January 1987 to nearly 10 percent by mid-October — a 250-basis-point rise in nine months. This rate increase was mechanically compressing equity valuations: a market trading at 20 times earnings at a 7.5 percent discount rate should be trading at roughly 14–15 times earnings at a 10 percent discount rate.

The US trade deficit was running at historically large levels — around $15–17 billion per month — and the dollar had weakened substantially. Congressional concern about the trade imbalance had produced the Gephardt amendment, legislation targeting countries with large trade surpluses with the United States. Fears of retaliatory tariffs from Japan and Germany added geopolitical uncertainty to an already stressed market.

The Federal Reserve had raised the discount rate in September 1987, confirming that monetary accommodation was not available to cushion any market decline. Alan Greenspan, who had replaced Paul Volcker as Fed chairman in August, had not yet established his reputation as a market-friendly central banker. Indeed, his first significant policy action — the September discount rate increase — was contractionary.

Wednesday October 14: The Record-Breaking Decline​

On Wednesday, October 14, the Commerce Department released August trade deficit data showing a deficit of $15.7 billion — worse than expected. The same day, the House Ways and Means Committee approved legislation eliminating the tax deductibility of interest on debt used in corporate takeovers. Combined with trade tensions, the tax change threatened the LBO boom that had underpinned equity valuations through much of the decade.

The Dow fell 95.46 points, or approximately 3.8 percent — the largest single-day point decline in the Dow's history to that date. Volume was heavy: more than 207 million shares traded on the NYSE, one of the heaviest days ever. For context, a 95-point decline in 1987, with the Dow at roughly 2,500, represented a meaningful valuation hit and a genuine shock to investor confidence.

Portfolio insurance programs recalculated required hedge ratios after the close. Many needed to increase their short futures positions to bring portfolios back within the guaranteed floor parameters. The orders were queued for execution the following morning.

Thursday October 15: The Follow-Through​

Thursday brought further losses, with the Dow declining approximately 58 points — roughly 2.3 percent. Volume remained elevated. Interest rate concerns continued: the 10-year Treasury yield was rising further, and bond market weakness was providing no offset to equity losses. Investors who might have expected "flight to quality" buying in bonds found instead that both asset classes were declining simultaneously.

The damage to portfolio insurance hedge ratios continued to accumulate. Each day's decline meant larger required hedge positions. More critically, the cumulative decline was moving some portfolios closer to their guaranteed floors — the levels at which portfolio insurance programs would need to be nearly fully hedged (nearly fully out of equities). Near the floor, the gamma of the position — the rate at which required hedging changes per unit of price move — is highest. The programs were entering their most dangerous zone.

Professional investors and trading desks were aware of the portfolio insurance dynamic. Some had studied LOR's published methodology and could estimate how much selling was likely to be generated at various price levels. Estimates circulating in mid-October suggested that tens of billions of dollars in futures sales could be required if the market declined meaningfully further.

Friday October 16: Bloody Friday​

Friday, October 16 was the most severe day of the pre-crash decline. The Dow fell 108.35 points — approximately 4.6 percent — on volume exceeding 338 million shares, a record at the time. The selloff was broad and accelerating; by the close, the market had fallen 9.5 percent for the week.

The Friday decline had several notable characteristics. First, it was concentrated in the afternoon — a pattern consistent with systematic, programmatic selling rather than news-driven random reactions. Second, the futures markets declined faster than the cash markets, suggesting that the bulk of the selling was occurring in futures — consistent with portfolio insurance execution. Third, specialists on the NYSE reported extreme difficulty maintaining orderly markets by the end of the session; some stocks had limited buying interest at any price.

The day earned the nickname "Bloody Friday" in market lore. For professional investors watching the cascade develop, the combination of a 9 percent weekly decline, a record-volume Friday selloff, and the known existence of large portfolio insurance programs queued for Monday execution created genuine concern about what Monday might bring.

By Friday's close, estimates of portfolio insurance futures-sell orders queued for Monday execution ranged from $10 billion to $20 billion or more. In a futures market that normally absorbed a few billion dollars of one-sided flow without major price impact, a $10–20 billion sell program was an extraordinary quantity.

The Weekend​

The Saturday and Sunday between Bloody Friday and Black Monday were uneventful in terms of major news developments — but the absence of stabilizing news was itself significant. There was no policy announcement, no calming statement from the Treasury or Federal Reserve, and no resolution of the trade tensions that had been a catalyst for the week's selling.

Treasury Secretary James Baker appeared on television Sunday and suggested that the United States might let the dollar fall further in response to German interest rate increases — implying that the administration was not going to coordinate with allies to support the dollar or calm markets. This statement, which was widely reported before Monday's open, arguably added to the downward pressure.

Meanwhile, at major investment banks and trading desks, traders and risk managers were reviewing the portfolio insurance sell estimates and discussing what Monday might look like. The general understanding was that Monday would be difficult. The specific magnitude — more than 20 percent — exceeded almost anyone's expectation.

The Opening on Monday October 19​

When the NYSE opened on Monday October 19, many stocks could not open immediately — the specialist system, which required dealers to buy shares when there were no other buyers, faced sell orders that far exceeded their capital and their willingness to absorb losses. Specialists for some of the largest S&P 500 components delayed opening trading for thirty minutes or more while they sought any buyers at all.

The pre-queued portfolio insurance selling hit a market where many issues were not yet open. Index arbitrageurs, who would normally link the futures and cash markets, found the arbitrage nearly impossible to execute: buying the cheap stocks was difficult when the stocks were not trading. The arbitrage linkage broke down, and the futures market — where portfolio insurance was selling — fell to a discount of 20 or more index points below the theoretical fair value implied by the cash market.

This decoupling of futures and cash markets was itself a feedback mechanism. Portfolio insurance models used futures prices as their input for calculating hedge requirements. Extremely low futures prices signaled a "market" far below the actual equity prices, generating hedge ratios that required even more selling. The models were running on prices that reflected illiquidity-driven discounts rather than genuine economic information.

Common Mistakes in Understanding the Pre-Crash Period​

Treating the week-before decline as a warning that should have triggered policy intervention. A 9 percent weekly decline, while severe, was within the range of historical corrections. There was no mechanism — and arguably no basis — for the Federal Reserve to intervene in equity markets in response to a correction that had not yet become a crisis. Hindsight makes the warning look clearer than it was in real time.

Assuming the Monday crash was inevitable from the previous Friday. The portfolio insurance sell orders queued for Monday were very large, but markets have absorbed large sell programs before without catastrophic declines. What made Monday so severe was the combination of the pre-queued selling, the specialist system breakdown, the futures-cash market decoupling, and the absence of any major buyer willing to step in at the initial prices.

Frequently Asked Questions​

Why didn't the exchanges close early on Friday to prevent the problem? Exchange closures require a genuine emergency — imminent market failure — not the anticipation of potential future problems. On Friday October 16, the market was declining steeply but was still functioning. Closing the exchange based on predictions about Monday would have required authority and decision-making frameworks that did not exist.

Did the Fed know about the portfolio insurance sell orders queued for Monday? The Federal Reserve had some information about portfolio insurance programs through its market surveillance, but had limited real-time visibility into the specific orders queued for Monday. The post-crash investigations identified better cross-market information sharing as a key gap.

Were any major investors buying before Monday's open? Some contrarian investors were examining whether the market offered value after the weekly decline. But the scale and certainty of the Monday sell overhang made buying before the open a high-risk proposition — the question was not whether the market would fall on Monday but by how much.

Summary​

The week before Black Monday was not just a precursor to the crash but its essential cause. The four trading days of October 14–16, 1987 — each driven by a combination of macro concerns (rising interest rates, trade tensions) and technical portfolio insurance dynamics — built the fuel charge that exploded on October 19. By Friday's close, sell orders representing tens of billions of dollars in futures positions were queued for Monday execution, the specialist system was already straining, and the most informed market professionals knew that Monday would be severe. What they could not anticipate was the complete breakdown of market microstructure that turned a severe day into the worst single-day crash in American financial history.

Next​

→ October 19: Anatomy of a Crash