Money and Business Cycles During 1981–1982, the total production of goods and services (called aggregate output) in the U.S. economy fell and the unemployment rate (the percentage of the available labor force unemployed) rose to over 10%. After 1982, the economy began to expand rapidly, and by 1989, the unemployment rate had declined to 5%. In 1990, the eight-year expansion came to an end, with the unemployment rate rising to above 7%. The economy bottomed out in 1991, and the subsequent recovery was the longest in U.S. history, with the unemployment rate falling to around 4%. A mild economic downturn began in March 2001, with unemployment rising to 6%; the economy began to recover in November 2001, with unemployment eventually declining to a low of 4.4%. Starting in December 2007, the economy went into a steep economic downturn and unemployment rose to over 10% before the economy slowly began to recover in June 2009. By 2017, the unemployment rate had fallen below 4%.
Why did the economy undergo such pronounced fluctuations? Evidence suggests that money plays an important role in generating business cycles, the upward and downward movement of aggregate output produced in the economy. Business cycles affect all of us in immediate and important ways. When output is rising, for example, it is easier to find a good job; when output is falling, finding a good job might be difficult. Figure 3 shows the movements of the rate of growth of the money supply over the 1950–2017 period, with the shaded areas representing recessions, or periods of declining aggregate output. We see that the rate of money growth declined before most recessions, indicating that changes in money growth might be a driving force behind business cycle fluctuations. However, declines in the rate of money growth are often not followed by a recession.
We explore how money and monetary policy might affect aggregate output in Chapters 20 through 26 (Part 6) of this book, where we study monetary theory, the theory that relates the quantity of money and monetary policy to changes in aggregate economic activity and inflation.