The smaller the underground economy the more will be the overstatement of the official unemployment rate

Assume the demand function for good X can be written as Qd = 80 - 3Px + 2Py + 10I where Px = the price of X, Py = the price of good Y, and I = Consumer income. This equation implies that X and Y are substitutes

Indicate whether the statement is true or false

Which is the most accurate statement about Wal-Mart?

A. It proves the case that bigness is always bad. B. It proves the case that bigness is always good. C. Directly and indirectly it saves American consumers up to $100 billion a year. D. It has used its monopoly power to force price increases.