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.