What impact did the auto industry have on the economy in the 1920's?

The mass production of automobiles in the 1920's affected the economy of the United States because mass production made technology affordable to the middle and lower classes because the mass production made it cheaper and quicker to build so more people could afford them. Because of this it developed all sorts of businesses that required transportation. The automobile industry's effects contributed to the construction of highway buildings, motels, service stations, used car dealerships and new housing outside the range of mass transportation.