If the productivity of an assembly line worker rises from 6 rivets per minute to 9 rivets per minute, we can say that her productivity

Refer to the scenario above. The housekeeper behaves in this particular way due to the ________

A) existence of asymmetric information B) presence of a positive externality C) presence of a free-rider problem D) existence of high incentive to work

Suppose Cournot duopolists firms (A and B) face the same market demand curve, and initially have identical costs. Firm A figures out a way of reducing its marginal cost. At the new Nash-Cournot equilibrium,

A) firm A's price falls. B) firm A's output expands and firm B's output contracts. C) firm B's profits expand. D) the price charged by both firms increases.