A basic characteristic of natural monopoly is
a. that the firm has control over the entire supply of a basic input.
b. that a firm is protected by a government franchise.
c. patent protection of certain basic processes.
d. continuously decreasing average costs as the firm expands output.
e. collusion with other competitors in an attempt to divide up the market.
In the short run, what adjustments take place when a perfectly competitive market in
long-run equilibrium experiences an increase in demand?
a. Price and profits fall, causing new firms to enter and existing firms to expand.
b. Price and output remain fixed.
c. Price rises but output remains unchanged.
d. Price rises and firms expand output by using existing capacity more intensively.
e. New firms enter and existing firms expand capacity, leading to an increase in supply
and a decline in price.