The Gini Coefficient is a number between zero and one that is a measure of inequality. An example is the concentration of suppliers in a market or industry. The Gini Coefficient is the ratio of the area under the Lorenz curve to the area under the diagonal on a graph of the Lorenz curve, which is 5000 if both axes have percentage units. The meaning of the Gini Coefficient: if the suppliers in a market have near-equal market share, the Gini Coefficient is near zero. If most of the suplliers have very low market share but there exist one or a few supplies providing most of the market share then the Gini Coefficient is near one.