Refer to the table above. What is the firm's marginal cost when it produces 155 units of the good?

When OPEC caused the price of oil to rise in the early 1970s, the:

a. aggregate supply curve shifted to the right. b. aggregate supply curve shifted to the left. c. aggregate demand curve shifted to the right. d. aggregate demand curve shifted to the left. e. price level in the economy fell.

When firms in an illegal market form a cartel, _____

a. they are able to supply higher quality products b. it becomes more difficult for police to detect their activities c. they are able to increase profits by behaving as a monopolist d. they face a deadweight loss e. they rely on goodwill to ensure the stability of the cartel