Compare the quantity, price and efficiency between

1) An oligopoly market and a monopoly market

2) An oligopoly market and a competitive market

3) A monopoly market and a competitive market

Suppose the annual membership fee of your fitness center is currently $100. Now suppose the fitness center has decided to increase the fee to $120 effective next year. If other things don't change,what will happen to the number of customers next year? If you choose to stay as a member next year, what will happen to the number of your visits to the center next year? Why? Use economic knowledge learned from this course to answer.