Answer :

Although "advantages" is an odd way to put it, the benefits stemming from the 1920s economic climate were that investing was at an all-time high. Of course this eventually led to the Great Depression.
Aazaran
The economy was awesome at the time. Because there were no machines to work assembly line style, people had to be employed to do the work. and when people were employed, they had money to buy things of their own. Because of this, there was a perfect cycle flow through the US industry.