It is generally acknowledged that the great boom of the 1920s began around July, 1921, after a year or more of sharp recession, and ended about July, 1929. Production and business activity began to decline in July, 1929, although the famous stock market crash came in October of that year. [...] the total money supply of the country, beginning with $45.3 billion on June 30,1921 and reckoning the total, along with its major constituents roughly semiannually thereafter. Over the entire period of the boom, we find that the money supply increased by $28.0 billion, a 61.8 percent increase over the eight-year period. This is an average annual increase of 7.7 percent, a very sizable degree of inflation.