Mario's Pizza and Bella's Pizza are in tacit collusion to cooperate and each charge a high price for their pizzas. If Mario's Pizza initially cooperates with Bella's Pizza, but then switches and charges a low price and Bella's Pizza responds by forever charging a low price, this is an example of ________.

The table below shows four alternative techniques for assembling a car. The cost of labor is $20 per hour, and the cost of capital is $10 per hour. Which of the four techniques for assembling a car is economically efficient?

A) T-1 B) T-2 C) T-3 D) T-4

In the market for cell phones, which of the following events increases the supply of cell phones?

A. New technology lowers the cost of making a cell phone B. Rise in the price of an e-book reader (a substitute in production) C. An increase in people's incomes D. A rise in the wage rate paid to electronics workers