In Recent Years, the Specification and Estimation of Demand Curves

In recent years, the specification and estimation of demand curves have changed so that:

A) analyses that used to be calculated in mainframe computers can now be carried out in a few seconds on a personal computer.
B) the growth and complexity of markets make those analyses ever more complex and difficult to calculate with accuracy.
C) the private sector often lacks the means or knowledge necessary for estimating demand relationships.
D) marketing experts make frequent use of data, but its use for designing government policies has been diminishing.