What would explain the increased totals for all cars made in the 1920s?

Assuming that this is referring to the same list of options that was posted before with this question, the correct response would be that the net incomes of much of the US population was increasing greatly during this time, thanks to the economic "boom" of the 1920s. 

Lol sorry i didnt answer ur question. but, did u know u can get ez points by typing random stuff : 3