Exploring the Root Causes of the 1987 Stock Market Crash

The 1987 stock market crash, also known as Black Monday, was one of the most significant events in financial history. On October 19, 1987, stock markets around the world experienced a sudden and severe decline in prices. The crash had a profound impact on the global economy and sparked widespread panic and uncertainty.

In this article, we will explore the root causes of the 1987 stock market crash, delving into the various factors that contributed to the collapse of stock prices. We will analyze the economic and financial conditions leading up to the crash, examine the role of technology and trading strategies, and explore the aftermath of this historic event.

Economic and Financial Conditions

The 1987 stock market crash occurred against the backdrop of a changing economic and financial landscape. In the years leading up to the crash, the global economy experienced rapid growth and inflationary pressures. Central banks, including the Federal Reserve in the United States, responded by raising interest rates to curb inflation.

This tightening of monetary policy had unintended consequences. Higher borrowing costs made it more expensive for businesses to invest and consumers to borrow, leading to a slowdown in economic activity. Additionally, the strengthening U.S. dollar made American exports less competitive in global markets, negatively impacting corporate earnings.

The financial markets also witnessed the rise of computerized trading systems and the use of complex trading strategies, which played a significant role in the crash. These systems relied on mathematical models to execute trades automatically, often exacerbating market volatility during times of stress.

Technological Factors

The 1987 stock market crash was one of the first major financial crises influenced by computerized trading systems. These systems, known as program trading, allowed investors to execute trades based on predefined criteria without human intervention. While intended to increase efficiency in the markets, these systems also introduced new risks and vulnerabilities.

One of the key factors contributing to the crash was the use of portfolio insurance, a risk-management strategy that utilized computer algorithms to automatically sell stocks when prices started to decline. This strategy, implemented by many institutional investors, resulted in a self-reinforcing cycle of selling as declining prices triggered more selling, leading to a rapid decline in stock prices.

The crash also exposed flaws in the clearing and settlement systems, which were ill-equipped to handle the volume and speed of trading during the crisis. Market participants faced significant challenges in processing and settling trades, further exacerbating the chaos in the markets.

The Role of Human Psychology

While technological factors played a significant role in the 1987 stock market crash, the crash was also fueled by human psychology and investor behavior. Investor sentiment played a crucial role in driving the rapid decline in stock prices as fear and panic spread throughout the markets.

The crash was preceded by a period of excessive optimism and speculation, with stock prices reaching new highs. As prices continued to rise, investors became increasingly complacent and ignored warning signs of potential market downturns. This complacency quickly turned to panic as selling intensified, causing a chain reaction of stock price declines.

The crash highlighted the impact of herd mentality in financial markets. As investors saw others selling, they followed suit, further amplifying the downward spiral in stock prices. In times of market stress, emotions often override rational decision-making, leading to exaggerated price movements.

Government Response

In response to the 1987 stock market crash, governments and regulatory authorities around the world took several measures to stabilize the markets and prevent future crashes. Central banks provided liquidity to the financial system, ensuring that banks had sufficient funds to meet their obligations. They also coordinated efforts to stabilize exchange rates and restore confidence in the markets.

Regulators implemented new rules and regulations to address the vulnerabilities exposed by the crash. In the United States, the Securities and Exchange Commission imposed limits on computerized trading systems and introduced circuit-breakers to halt trading during periods of extreme volatility.

Lessons Learned

The 1987 stock market crash served as a stark reminder of the interconnectedness of financial markets and the risks associated with automated trading systems. It highlighted the need for robust risk management practices and regulatory oversight. Since then, financial institutions have implemented more comprehensive risk controls, including stress-testing models and stricter oversight of algorithmic trading.

The crash also underscored the importance of investor education and understanding market dynamics. Investors today are more aware of the risks and challenges inherent in financial markets, but the need for continued vigilance remains. Understanding the psychology of market participants and being mindful of herd mentality can help investors make more informed decisions during times of market stress.


The 1987 stock market crash was a watershed event in financial history, marking the first major financial crisis influenced by computerized trading systems. The crash was fueled by a combination of economic and financial conditions, technological factors, and human psychology.

While the crash had far-reaching consequences, it also served as a catalyst for change. Regulators and financial institutions implemented measures to stabilize the markets and prevent future crashes. The crash highlighted the need for robust risk management practices and investor education.

Today, financial markets are more interconnected than ever, and the use of technology continues to shape trading strategies. Understanding the root causes of the 1987 stock market crash can help us navigate future market downturns and ensure the stability and resilience of our financial system.

24 October 2023
Written by John Roche