Credit card debt is

The major criticism of the view that expectations are formed adaptively is that

A) this view ignores that people use more information than just past data to form their expectations. B) it is easier to model adaptive expectations than it is to model rational expectations. C) adaptive expectations models have no predictive power. D) people are irrational and therefore never learn from past mistakes.

The competitive firm's supply curve is equal to

A) its marginal cost curve.
B) the portion of its marginal cost curve that lies above AC.
C) the portion of its marginal cost curve that lies above AVC.
D) the portion of its marginal cost curve that lies above AFC.