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2. Before World War I, blank percent of U.S. factories ran on electricity.
3. also changed the way they operated. Many employers hired experts with advanced knowledge to create scientific management methods.
4. buying. Encouraged by ads, consumers found a new way to make purchases. With blank , consumers bought goods by making small, regular payments over a period of time.
6. After World War I, the United States went through a blank or economic downturn.
8. Businesses also changed the way they operated. Many employers hired blank with advanced knowledge to create scientific management methods.
9. national product. It continued growing for most of the decade. In 1922 the nation's blank (GNP)—the total value of all goods and services produced—was $70 billion.

1. Scientific management lowered costs and increased blank —the amount of work each worker could do.
2. Larger businesses began using mass-production.
5. hundred billion By 1929 GNP had risen to $100 billion.
7. This meant they could charge blank for them—and increase profits at the same time.