Most advances in health care are due to ______.

When economists say entrepreneurs have a comparative advantage in arbitrage activity, they are saying

A) entrepreneurs are efficient at selling their products below cost. B) entrepreneurs are efficient at selling their products at cost. C) entrepreneurs are efficient at discovering opportunities to buy goods low and sell them at higher prices. D) entrepreneurs are efficient at resolving disputes of interest over titles to scarce property rights.

Assuming the inverse demand function for good Z can be written as P = 90 - 3Q, the corresponding total revenue function is:

A) 6Q. B) 90 - 6Q. C) 90 - 3Q. D) 90Q - 3Q2.