The accompanying table shows the Herfindahl-Hirschman Index (HHI) for the restaurant, cereal, movie, and laundry detergent industries as well as the advertising expenditures of the top 10 firms in each industry in 2006. Use the information in the table to answer the following questions.

a. Which market structure-oligopoly or monopolistic competition-best characterizes each of the industries?
b. Based on your answer to part a, which type of market structure has higher advertising expenditures? Use the characteristics of each market structure to explain why this relationship might exist.

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Advertising expenditures (millions) Industry Restaurants Cereal Movie studios Laundry detergent HHI 179 2,098 918 2,068 $1,784 732 3,324 132