Suppose the Government Has Imposed a Price Ceiling on Laptop

Multiple Choice

Suppose the government has imposed a price ceiling on laptop computers.Which of the following events could transform the price ceiling from one that is not binding into one that is binding?

A) Improvements in production technology reduce the costs of producing laptop computers.
B) The number of firms selling laptop computers decreases.
C) Consumers' income decreases,and laptop computers are a normal good.
D) The number of consumers buying laptop computers decreases.