The argument that econometric policy evaluation is likely to be misleading if policymakers assume stable economic relationships is known as

Classical growth theory predicts that increases in real GDP per person will

A) last because people make choices in the pursuit of higher profits. B) not last because higher income encourages smaller families and a lower population growth rate. C) not last because higher income leads to a population explosion. D) last because higher growth leads to new technology. E) last only if the government directs firms to make more investments in capital and new technology.

Suppose Kate's Great Crete (KGC) has annual variable costs of VC = 30Q + 0.0025Q2 and marginal costs of MC = 30 + 0.005Q, where Q is the number of cubic yards of concrete it produces per year. In addition, it has an avoidable fixed cost of $50,000 per year. KGC's demand function is Qd = 20,000 - 400P. What is the profit maximizing sales quantity?

A. 20 B. 2,000 C. 8,000 D. 0