An asset-price bubble is caused by:

A. people buying assets because they believed prices would keep going up and they'd be able to sell for a profit.
B. fads that make owning a certain asset fashionable.
C. severe inflation within a short period of time.
D. the increase in the value of durable goods when the economy is experiencing low inflation.

A. people buying assets because they believed prices would keep going up and they'd be able to sell for a profit.