Hannah and Kay (1977) suggest several criteria a specific concentration measure should satisfy. What are those?

1. Concentration curve ranking criterion - industry A is more concentrated than industry B if firms’ cumulative market share for A is greater at all points in the size distribution. 2. Sales transfer criterion - transfer of sales from smaller to larger firms should increase measured concentration 3. Entry criterion - entry of a new firm (smaller than the average size of existing firms) should decrease measured concentration 4. Merger criterion - merger of firms should increase measured concentration