A market has four individuals, each considering buying a grill
for his backyard. Assume that grills come in only one size and
model. Abe considers himself a grill-master, and finds a grill a
necessity, so he is willing to pay $400 for a grill. Butch is a
meat-lover, honing his grilling skills, and is willing to pay $350
for a grill. Collin just met the girl of his dreams, and she loves
a good grilled steak, so in his effort...