The aggregate demand curve is downward sloping

A ________ between price and quantity sold because ________

A) monopoly faces a tradeoff; to sell a larger quantity, it must lower its price B) monopoly does not face a tradeoff; it controls market entry and can sell at any price and any quantity C) natural monopoly faces a tradeoff; it can always price discriminate D) natural monopoly does not face a tradeoff; it is a price maker E) perfectly competitive firm faces a tradeoff; it is a price taker

The economic system that is generally considered to be the most efficient at answering the What to produce and the How to produce questions is the:

A. market economy. B. command economy C. soviet economy. D. traditional economy.