John and jack are both trying to sell a used car to jim. john’s car is a lemon, a car that has a serious but nonobvious problem. jack’s car is a cherry, a car that has no problems. jim cannot tell the difference between the cars. economists say this information problem might be solved with signaling. who has an incentive to find a way to signal quality? a. both jack and johnb. jack but not johnc. john but not jackd. jim