Answer:
Consumers buying goods on credit.
Step-by-step explanation:
During the 1920s, the Fed promoted the growth of the money supply, which gave banks a lot of funds to approve loans with. This resulted in a rapid growth in credit, as many consumers took advantage of the easy credit policies to buy goods.
This amount of credit created an economic bubble that bursted in 1929 with the stock market crash, and that finally gave way to the Great Depression of the 1930s.