In the following list are a number of well-known companies and the products that they sell. Which of the four types of markets (perfect competition, monopoly, monopolistic competition, and oligopoly) best characterizes the markets in which they compete? Explain why.
a. McDonald's-hamburgers
b. ExxonMobil-gasoline
c. Dell-personal computers
d. Heinz-ketchup
e. Procter & Gamble-disposable diapers
f. Starbucks-gourmet coffee
g. Domino's-pizza
h. Intel-computer chip for the PC