located between the 45° line representing an equal distribution of income and the Lorenz curve representing the actual distribution of income within the population. In a market concentration context, the Lorenz curve can be plotted ranking firms' market shares from smallest to largest to simulate a concentration curve. The firms’ cumulative percentage shares would remain on the y axis and the cumulative percentage of sellers would remain on the x axis. would the sum of weighted market share located in the area above the concentration curve. The Gini coefficient is 0 when the concentration curve aligns with the 45° line representing a single firm's market share, meaning the market is a monopoly. See also Concentration ratio Dominance (economics) Gini coefficient Herfindahl index Horizontal Merger Guidelines Lorenz curve Inequality of wealth Market failure Monopoly Probability distribution Stochastic dominance Relative market share References Bain, J. (1956). Barriers to New Competition. Cambridge, Massachusetts: Harvard Univ. Press. Curry, B. and K. D. George (1983). "Industrial concentration: A survey" Jour. of Indust. Econ. 31(3): 203–55 Tirole, J. (1988). The Theory of Industrial Organization. Cambridge, Massachusetts: MIT Press. Weiss, L. W. (1989). Concentration and price. Cambridge, Massachusetts : MIT Press. External links Department of Justice and Federal Trade Commission Horizontal Merger Guidelines Concentration indicators Imperfect competition Market structure Monopoly (economics)