One Problem with Using Historical Data to Estimate Demand Is

Multiple Choice

One problem with using historical data to estimate demand is the

A) fact that people do not always buy what they need.
B) large number of interviews that must be conducted to gather information on buyers' intentions.
C) many variations in price necessary to measure changes in demand.
D) likelihood that the demand curve has shifted over the time period covered by the data.
E) need to have both price and quantity data to estimate demand.