Owen runs a delivery business and currently employs three drivers. He owns three vans that employees use to make deliveries, but he is considering hiring a fourth driver. If he hires a fourth driver, he can schedule breaks and lunch hours so that all three vans are in constant use, allowing him to increase deliveries per day from 60 to 75. It will cost an additional $75 per day to hire the fourth driver. The marginal cost per delivery of increasing output beyond 60 deliveries per day:

Trade will take place: a. if the maximum that a consumer is willing and able to pay is less than the minimum price the producer is willing and able to accept for a good. b. if the maximum that a consumer is willing and able to pay is greater than the minimum price the producer is willing and able to accept for a good. c. only if the maximum that a consumer is willing and able to pay is equal to the minimum price the producer is willing and able to accept for a good. d. none of the above.