When the opportunity cost of producing more of a good is increasing, the marginal cost of producing more of the good is

Roberta spends all of her income on two items, staplers and paper clips. If the price of a stapler increases, there will be a ________ Roberta's demand curve for staplers and a ________ Roberta's demand curve for paper clips

A) rightward shift of; leftward shift of B) leftward shift of; movement along C) movement along; rightward shift of D) movement along; leftward shift of

Producer surplus is equal to the area

A) under the demand curve and above the supply curve. B) above the supply curve and below the price line. C) under the demand curve. D) under the supply curve. E) under the demand curve and above the price line.