ersey Mike's Sub Shop offers its customers a card to stamp each time they buy a sandwich. When the card is full, the customer can redeem it for a free sandwich. This sales promotion is a _

With signals from no-claim bonuses and deductibles, a. the marginal cost curve for careful drivers lies to the left of the marginal cost curve for aggressive drivers b. auto insurance companies insure more aggressive drivers than careful drivers because aggressive drivers have a greater need for the insurance c. the market for car insurance has a separating equilibrium, and the market is efficient d. most drivers pay higher premiums than if the market had no signals