In a market-based economy, the government

There is a technological advance in the production of ice cream. As a result, the supply curve of ice cream shifts ________ and ________

A) leftward; both the equilibrium price and equilibrium quantity fall B) rightward; both the equilibrium price and equilibrium quantity fall C) rightward; the equilibrium price falls while the equilibrium quantity increases D) rightward; both the equilibrium price and equilibrium quantity rise

When a firm's profit maximizing sales level is positive, its marginal revenue is ______ its marginal cost at that quantity.

A. greater than B. less than C. equal to D. less than or equal to