When a Firm's Production Function Exhibits Constant Returns to Scale

Multiple Choice

When a firm's production function exhibits constant returns to scale:

A) the short-run average cost curve will be horizontal.
B) the long-run average cost curve will be U-shaped.
C) the long-run marginal cost curve will be upward sloping.
D) the short-run average variable cost curve will be downward sloping.
E) the long-run average cost curve will be horizontal.