单选题 Under which pair of conditions is a factor of production least likely to earn economic rent? Supply curve Demand curve A. Upward sloping Downward sloping B. Perfectly elastic Downward sloping C. Upward sloping Perfectly elastic

【正确答案】 B

【答案解析】If the supply of a productive resource is perfectly elastic, it earns no economic rent. Elasticity of demand is not directly related to economic rent.