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Black Monday 1987

The Day the Dow Lost 22.6%

Your economics or history teacher just assigned a unit on financial crises, or you are staring down a test question about the 1987 stock market crash and have no idea where to start. This guide cuts straight to what you need to know.

**TLDR: Black Monday 1987** covers one of the most dramatic single days in financial history — October 19, 1987, when the Dow Jones Industrial Average fell 22.6% in a single session. In about 15 focused pages, you will understand the 1980s bull market that set up the disaster, what actually happened on trading floors in New York, London, Hong Kong, and Tokyo that day, and why financial engineering tools like portfolio insurance turned a bad day into a historic collapse.

This is a **stock market crash history study guide** written for students who are not finance majors. Every term is defined the first time it appears. Every explanation starts with a concrete example before moving to the bigger picture. The book also covers the aftermath: circuit breakers, the so-called Greenspan Put, and the regulatory changes that still shape how markets work today.

If you are looking for a **financial history primer for beginners** — or you are a parent helping your student prep for an AP Economics, AP US History, or economics elective unit — this is the 20-page read that gets you oriented fast.

Grab your copy and walk into class knowing exactly what broke the market in 1987.

What you'll learn
  • Describe the events of October 19, 1987 and place them in the context of the bull market that preceded them
  • Explain the role of portfolio insurance, program trading, and index arbitrage in amplifying the crash
  • Compare Black Monday to other major market events like 1929 and 2008
  • Identify the policy and structural responses, including circuit breakers and the Greenspan Fed's intervention
  • Evaluate competing historical explanations for why the crash happened when it did
What's inside
  1. 1. Setting the Stage: The 1980s Bull Market
    Orients the reader to the economic and financial environment of the mid-1980s that set up the crash.
  2. 2. The Day Itself: October 19, 1987
    A minute-by-minute narrative of Black Monday in New York, Hong Kong, London, and Tokyo.
  3. 3. What Broke the Market: Portfolio Insurance and Program Trading
    Explains the financial engineering that turned a bad day into a historic crash.
  4. 4. Competing Explanations: Why That Monday?
    Surveys the historical debate over the trigger, from interest rates to tax policy to pure herd psychology.
  5. 5. The Aftermath: Circuit Breakers, the Greenspan Put, and What Changed
    Covers the regulatory and institutional response and how Black Monday reshaped modern finance.
Published by Solid State Press
Black Monday 1987 cover
TLDR STUDY GUIDES

Black Monday 1987

The Day the Dow Lost 22.6%
Solid State Press

Black Monday 1987

The Day the Dow Lost 22.6%

Copyright © 2026 Solid State Press.

Published by Solid State Press.

All rights reserved. No part of this book may be reproduced or transmitted in any form without prior written permission, except for brief quotations in critical reviews and educational use.

Part of the TLDR Study Guides series.

Contents

  1. 1 Setting the Stage: The 1980s Bull Market
  2. 2 The Day Itself: October 19, 1987
  3. 3 What Broke the Market: Portfolio Insurance and Program Trading
  4. 4 Competing Explanations: Why That Monday?
  5. 5 The Aftermath: Circuit Breakers, the Greenspan Put, and What Changed
Chapter 1

Setting the Stage: The 1980s Bull Market

Between August 1982 and August 1987, the Dow Jones Industrial Average (the DJIA, or simply "the Dow") — an index that tracks the stock prices of thirty large American companies and serves as the most widely watched barometer of the U.S. stock market — rose from roughly 776 points to 2,722 points. That is a gain of more than 250 percent in five years. To understand why October 19, 1987 was so shocking, you have to understand just how euphoric those five years had been.

The Reagan Economy

The bull market (a period of broadly rising stock prices, typically defined as a gain of 20 percent or more from a recent low) had roots in policy. When Ronald Reagan took office in January 1981, the U.S. economy was stuck in stagflation — high inflation combined with slow growth. The Federal Reserve, led by Paul Volcker, broke inflation by pushing interest rates to painful heights, touching 20 percent in 1981. The short-term cost was a brutal recession. The payoff came in 1982: inflation fell, the Fed eased rates, and the economy began expanding. That recovery launched the bull market.

Reagan's administration layered two more accelerants on top. First, the 1981 tax cuts (the Economic Recovery Tax Act) reduced the top marginal income tax rate from 70 percent to 50 percent, and later cuts in 1986 brought it to 28 percent. Lower taxes left more corporate earnings for shareholders. Second, deregulation — the loosening or removal of government rules on industries — accelerated across banking, energy, and transportation. Financial markets were a particular beneficiary. Restrictions on brokerage commissions had already been lifted in 1975; through the early 1980s, rules separating commercial banking from investment activity were steadily eroded. Money flowed more freely, and Wall Street grew rapidly.

The LBO Wave

One of the most visible signs of the era was the explosion of leveraged buyouts, or LBOs. In an LBO, a private investor or firm buys a publicly traded company using mostly borrowed money (leverage), takes the company private, restructures it — often by cutting costs or selling divisions — and aims to profit when the company is resold or re-listed. Because interest payments on debt were tax-deductible, debt-heavy deal structures were especially attractive under the U.S. tax code.

About This Book

If you are a high school student who needs a clear, accurate account of the 1987 stock market crash for a history class, an AP Economics or AP United States History assignment, or a college intro finance course, this is your starting point. It also works for parents helping a student review and for tutors who need a fast refresh on US financial history before a session.

This book is a focused financial history primer for beginners who want to understand what caused the 1987 market crash — the bull market that preceded it, how program trading and portfolio insurance turned a bad day into a historic collapse, and why the Dow dropped 22.6% in a single session. A concise overview with no filler.

Read straight through from Section 1 to Section 5, then attempt the practice questions at the end to check your understanding before an exam or class discussion.

Keep reading

You've read the first half of Chapter 1. The complete book covers 5 chapters in roughly fifteen pages — readable in one sitting.

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