The Borish Method for Historical Analogs: Deconstructing the 1987 Crash Call

Peter Borish, in his capacity as the second-in-command to the legendary Paul Tudor Jones at Tudor Investments, etched his name into financial history through his instrumental role in predicting the 1987 stock market crash. This was not an act of clairvoyance but rather the product of a rigorous and data-intensive analytical process. At the core of this process was the application of historical market analogs, a technique that involves identifying and studying past market cycles to forecast potential future outcomes. Borish’s masterful use of the 1929 market crash as an analog for the conditions leading up to Black Monday in 1987 stands as a seminal case study in the power of this approach.

The Concept of Historical Analogs

The theory underpinning historical analogs is that while history does not repeat itself verbatim, it often rhymes. Financial markets, driven by the immutable forces of human psychology, exhibit recurring patterns of behavior. Greed and fear, the primary drivers of market sentiment, manifest in predictable ways across different eras. By identifying a past market environment that bears a striking resemblance to the present, a trader can gain a probabilistic edge in anticipating the market’s next major move. This is not a simple exercise in chart overlaying; it is a multi-faceted analysis that encompasses macroeconomic conditions, sentiment indicators, and price action.

The 1929 vs. 1987 Analog: A Deep Dive

Borish’s 1987 call was not a sudden epiphany but the culmination of months of meticulous research. He and his team at Tudor Investments undertook the laborious task of digitizing and analyzing vast amounts of historical market data, a far more challenging endeavor in the pre-internet era. The analog that emerged as the most compelling was the period leading up to the 1929 stock market crash. The parallels were uncanny.

Macroeconomic Similarities: Both the 1920s and the 1980s were periods of significant economic expansion and technological innovation. The post-World War I boom of the “Roaring Twenties” had its counterpart in the Reagan-era economic recovery and the dawn of the personal computer age. In both cases, a prolonged period of prosperity had built a sense of complacency and a belief that the good times would never end.

Sentiment and Valuation: By the summer of 1987, the stock market had been in a effective bull run for five years, with valuations reaching stretched levels. The prevailing sentiment was one of unbridled optimism, with retail and institutional investors alike piling into the market. This mirrored the speculative fervor of the late 1920s, where the stock market was seen as a one-way ticket to riches.

Price Action and Volatility: The price action in the months leading up to the 1987 crash closely tracked the pattern of the 1929 market. Both periods were characterized by a final, parabolic surge in prices, followed by a sharp increase in volatility. This “blow-off top” is a classic sign of a market reaching an exhaustion point, as the last of the buyers are drawn in just before the trend reverses.

The Execution and Risk Management

Identifying the analog was only half the battle; the other half was executing the trade and managing the immense risk involved. Paul Tudor Jones, with Borish providing the analytical firepower, began to build a short position in the S&P 500 futures market. This was not a single, all-in bet but a carefully calibrated campaign of “probing” the market. They would initiate small short positions, and if the market continued to rally, they would exit with a small, predetermined loss. This approach allowed them to test their thesis without exposing themselves to catastrophic losses if they were wrong.

As the market began to show signs of weakness in the fall of 1987, they became more aggressive in their shorting. The key was their unwavering commitment to their risk management discipline. Every position had a tight stop-loss, and they were prepared to be wrong multiple times. This is the essence of Borish’s philosophy of “Discipline before vision.” No matter how strong the conviction in a trade, the market is the ultimate arbiter, and one must always be prepared to accept its verdict.

When the crash finally came on Black Monday, October 19, 1987, Tudor Investments was positioned to profit handsomely. But their success was not a matter of luck; it was the result of a well-defined and rigorously executed trading plan. The 1987 crash call remains a evidence to the power of historical analogs and the importance of a disciplined, data-driven approach to trading.

Applying the Borish Method Today

The tools and data available to traders today are vastly superior to what Borish had at his disposal in the 1980s. However, the core principles of his approach remain as relevant as ever. To apply the Borish method, traders must be willing to do the hard work of historical research, to look for patterns not just in price charts but in the broader economic and psychological context. They must have the patience to wait for the right setup and the discipline to manage their risk relentlessly. The 1987 crash was a once-in-a-generation event, but the lessons it teaches are timeless. By studying the work of traders like Peter Borish, we can learn to navigate the complexities of the market with greater skill and confidence.