What was the effect of the increasing use of installment buying during the 1920s? unemployment steadily increased.
consumer spending greatly increased.
the national debt began to grow quickly.
the u. s. economy industrialized rapidly.

One of the effects of the increasing use of installment buying during the 1920s is that consumer spending greatly increased.
Installment buying refers to the fact that you don't have to pay for something immediately, but rather pay a certain amount of money on a monthly basis. This led to people buying more and more products, because now they were able to afford it.