________ occurs when a person acquires more detailed knowledge and develops more memory and experience, has contacts with others in the same field of endeavor

Which of the following statements about the perfect competitor is INCORRECT?

A) The perfectly competitive firm is always a price taker. B) The perfect competitor sells a homogeneous commodity. C) If an individual firm raises price, it will lose business. D) The products made by a perfectly competitive firm have no close substitutes.

When a person's income rises and the tax rate is constant, the tax is a

a. regressive tax b. poll tax c. progressive tax d. head tax e. proportional tax