Final answer:
The consumerism of the 1920s was largely driven by advertising and installment plans that encouraged buying. Advances in technology and mass production made goods more readily available, and advertising convinced Americans that buying more goods led to a better life.
Step-by-step explanation:
A major reason for the consumerism of the 1920s was advertising and installment plans encouraged buying. During this time, advances in technology and mass production made goods more readily available at favorable prices.
Advertising played a significant role in convincing Americans that buying more goods was the key to a better life. Additionally, installment plans allowed people to purchase goods on credit, further fueling consumerism.