Question

in the 1920s, a method that enabled people to buy goods they could not afford was
buying on margin.
investing.
speculation.
installment payments.

Explanation:

In the 1920s, installment payments allowed people to purchase goods by paying over time, even if they couldn't afford the full price upfront. Buying on margin and speculation were more related to stock market practices, and investing is a broader term not specific to affording unaffordable goods.

Answer:

D. installment payments.