In microeconomic theory, monopolies constitute a market structure characterized by a single seller facing a downward-sloping demand curve with high barriers to entry that prevent competition. This theoretical framework relies on formal definitions involving the marginal revenue (MR) being less than price (P), resulting in an equilibrium where allocative efficiency is not achieved because quantity produced falls short of the socially optimal level defined by social welfare maximization. As a fundamental subfield within industrial organization and microeconomic analysis, it establishes the normative distinction between private profit-maximization outcomes and public interest standards regarding deadweight loss and price discrimination mechanisms.
A pure monopoly is a market served by a single seller of a good with no close substitutes, and its durable power derives not from market share alone but from barriers to entry — regulatory privilege,…