An Upward-Sloping Labor Supply Curve Reflects the

Multiple Choice

An upward-sloping labor supply curve reflects the

A) higher wage rate that must be paid to meet workers' opportunity costs
B) lower wage rate that is paid to meet workers' opportunity costs
C) increased willingness of firms to hire the labor supplied at increasing wage rates
D) fact that not all workers are equally productive
E) higher marginal productivity of the additional worker supplied