Suppose you hire a real estate agent and tell him to sell your house to the highest bidder. You pay the real estate agent a flat fee of $50,000 when the house is sold. You learn that, unfortunately, the agent sells the house to the first bidder at a low price. a. What is this type of problem called? b. What is one way to change the real estate agent's incentive so he does sell to the highest bidder, instead of the first one?