Suppose that a competitive market is initially in equilibrium. Then demand increases. If some resources used in production are not available in sufficient quantities for entering firms,
a. the long-run market supply curve will be upward sloping.
b. the long-run market supply curve will be perfectly elastic.
c. in the long run firms will suffer economic losses, leading them to exit the industry.
d. the number of firms will decrease, and the market will become a monopoly.