If the long-run supply curve for a perfectly competitive industry

has a positive slope, the industry experiences

A) external economies.

B) external diseconomies.

C) internal economies.

D) internal diseconomies.

Assuming long-run external economies exist, when demand

increases in a perfectly competitive market, in the long run the

average total cost curve for a typical firm

A) shifts downward.

B) shifts upward.

C) stays the same.

D) is no longer U-shaped.

Can someone please answer these two questions in the second question I wanted to ask wont price increase when demand increases