In the 1920s manufacturing encourage consumerism by offering

A greater variety of goods for fair prices, is the right answer.

Explanation:

Businesses throughout the 1920's used advertisements to expand consumerism within the U.S. These commercials were prosperous because businesses were now offering more goods for cheaper rates. This decrease in price can be added to inventiveness such as the assembly line, which unexpectedly reduced the value of manufacturing goods. This discounted cost in manufacturing goods provided for companies to offer products for a lower price. This reduction in price made residents more likely to buy such goods.