Monetary policy is conducted by the U.S. Treasury Department

An unregulated, single-price monopoly is shown in the figure above. If fixed cost is $20, the monopoly's total costs when it is maximizing its profit will be

A) $30. B) $40. C) $80. D) $140.

Which of the following is not a common mistake made by consumers?

A) the failure to ignore sunk costs B) being overly pessimistic about their future behavior C) the failure to take into account the implicit costs of an activity D) being overly optimistic about their future behavior