Monopoly and High Barriers to Entry
Pure monopoly is a market structure characterized by (a) high barriers to
entry and (b) a single seller of a well-defined product for
which there are no good substitutes. Pure monopoly is at the
opposite:nd of the market-structure spectrum from pure
competition.
Analysis of pure monopoly is important for two reason;. First, the
monopoly model will help us understand the operation:'f markets
dominated by a few firms. Second, in a few important industries,
such as telephone services and utilities, there is often only a
single producer in a market area. The monopoly model will help
us understand these markets.
The three major barriers to entry into a market are legal restrictions,
economies of scale, and control of an essential resource.
The monopolist's demand curve is the market demand curve. It slopes
downward to the right. The marginal revenue curve for a
monopolist will lie inside the demand curve because of revenue
losses from the lower price for units that could have been sold
at a higher price.
For the elastic portion of a monopolist's demand curve, a Lower price
will increase total revenue. For the inelastic portion of the
monopolist's demand curve, a price reduction will cause total
revenue to decline. A profit-maximizing monopolist will not
operate on the inelastic portion of the demand curve because in
that range it is always possible to increase total revenue by
raising the price and producing fewer units.
A profit-maximizing monopolist will lower price and expand output as long
as marginal revenue exceeds marginal cost. At the maximum profit
output, MR will equal MC. The monopolist will charge a price
along its demand curve for that output rate.
If losses occur in the long-run, a monopolist will go out of business. If
profit results, high barriers to entry will shield a monopolist
from competitive pressures. Therefore, long-run economic profits
for a monopoly are sometimes possible.
Economists are critical of a monopoly because (a) it severely limits the
role of demand in the market for a good and thus consumers
"'control" over
the producer; (b) the unregulated monopolist produces too little
output and charges a price in excess of the marginal cost; (c)
profits are less able to stimulate new entry, which would expand
the supply of the product until price declined to the level of
average production costs; and (d) legal monopoly encourages
rent-seeking activity.
Natural monopoly exists when long-run average total costs continue to
decline as firm size increases (economies of scale). Thus, a
larger firm always has lower costs. Cost of production will be
lowest when a single firm generates the entire output of an
industry.
In the presence of natural monopoly, there are three policy alternatives:
(a) private, unregulated monopoly; (b) private, regulated
monopoly; and (c) government ownership. Economic theory suggests
that each of the three will fail to meet our criteria for ideal
efficiency. Private monopoly will result in higher prices and
less output than would be ideal. Regulation will often fail to
meet our ideal efficiency criteria because (a) the regulators
will not have knowledge of the firm's cost curves and market demand conditions; (b) firms have an
incentive to conceal
their actual cost conditions and take profits in disguised forms
and (c) the regulators often end up being influenced by
the firms they are supposed to regulate. Under public ownership
managers often can gain by pursuing policies that yield them
personal benefits and by catering to the views of special
interest groups (for example well organized employees and
specialized customers) who will be able to help them further
their political objectives.
Even a monopolist is not completely free from competitive pressures. All
products have some type of substitute. Monopolists who raise the
price of their products provide encouragement for other firms to
develop substitutes, which may eventually erode the market power
of the monopolist. Some monopolists may charge less than the
short-run profit-maximizing price to discourage potentiaL
competitors from developing substitute products.
Monopoly profits derived from patents have two conflicting effects on
resource allocation. Once a product or process has been
discovered, the monopoly rights permit the firm to restrict
output and raise price above the current marginal (and average)
cost of production However, the possibility of future monopoly
rights granted by a patent encourage entrepreneurs to improve
products and develop lower cost methods of production.