A market where there is a threat of competition, not necessarily actual competition, but the threat could be enough to affect the behavior of firms in the market
Has increased the contestability of markets by reducing barriers to entry and exit, allowing for greater innovation and disruption, and improving information
1.Monopolist lowers price and increases quantity to the limit price (where average cost equals average revenue) to eliminate the threat of entry and competition
2. Monopolist is prepared to compete with lower prices and higher quantities if entry does occur