Table 1. Percentage of Sales for Four Largest Firms in Selected U.S. Retail Industries
Industry (NAICS code) | 1992 | 1997 | 2002 | 2007 |
Food & beverage stores (445) | 15.4 | 18.3 | 28.2 | 27.7 |
Health & personal care stores (446) | 24.7 | 39.1 | 45.7 | 54.4 |
General merchandise stores (452) | 47.3 | 55.9 | 65.6 | 73.2 |
Supermarkets (44511) | 18.0 | 20.8 | 32.5 | 32.0 |
Book stores (451211) | 41.3 | 54.1 | 65.6 | 71.0 |
Computer & software stores (443120) | 26.2 | 34.9 | 52.5 | 73.1 |
