The correct answer to this open question is the following.
The ways in which movies, for all their glamour, were similar to the automobile industry as developed by Henry Ford, was in the consumerism behavior of those years.
Let's have in mind that there was a name for that consumerism period called "the Roaring 1920s," in which people had money and spend most of it on new cars, houses, furniture, and other things. The purchase of things was made mostly on credit. The movie industry became part of that glamour for the press cover it had and the creation of stars that became so popular.