Only a change in the price level can cause shifts in both the aggregate expenditure line and the aggregate demand curve

In the simple circular flow

A) producers trade goods and services for monetary payments in the product market. B) consumers trade resources for goods and services in the factor market. C) businesses trade goods and services for resources in the product market. D) consumers trade goods and services for monetary payments in the factor market.

A form of implicit collusion where one firm in an oligopoly announces a price change which is matched by other firms in the same industry is

A) "tit-for-tat" pricing. B) "follow the leader" pricing. C) retaliation pricing. D) price leadership.