If the market in the figure above is a profit-maximizing single-price monopoly, the producer surplus is the area ________

There are different interest rates associated with many types of securities. Which of the following statements is correct?

A) they vary depending on the liquidity of the security B) they vary depending on the risk associated with the security C) except in very unusual times, most interest rates move together D) all of the above E) none of the above

Marginal cost is equal to average variable cost

A) when average variable cost is at its minimum value. B) when marginal cost is at its minimum value. C) when average variable cost is getting smaller. D) when average variable cost is getting larger.