a market structure in which one firm makes up the entire market. the firm faces no competitive pressure from other firms.
Difference between Monopoly and perfect competitor
A competitive firm does not take into account the effect of its output decision on the price it receives. a competitive firm's marginal revenue is the given market price. a monopolistic firm takes into account that its output decision can affect price. its marginal revenue is not its price.
A barrier to entry that might exist is that a firm is better at producing a good than anyone else. it has unique abilities that make it more efficient than all other firms.
an industry in which a single firm can produce at a lower cost than can 2 or more firms
1) many sellers 2) differentiated products 3) multiple dimensions of competition 4) easy entry of new forms in the long run.
strategic decision making
taking explicit account of a rival's expected response to a decision you are making
cartel model of oligopoly
a model that assumes that oligopolies act as if they were monopolists that have assigned output quotas to individual member firms of the oligopoly so that total output is consistent with joint profit maximization.
multiple firms make the same pricing decisions even though they have not explicitly consulted with one another
contestable market model
a model of oligopoly in which barriers to entry and carriers to exit, not the structure of the market, determine a firm's price and output decisions.
the value of sales by the top firms of an industry stated as a percentage of total industry sales