Retail industry abroad, called coefficient of basket for basket size, refers to the number of goods in the basket, which is a central indicator measure the quality of the shopping basket. When only one product in the shopping basket when we basket coefficient can be defined as 1; when there are two commodities, defined as 2;

Of the same commodity basket coefficient: quantity of a product in the shopping basket, to reveal packaging specifications are appropriate.

Coefficient of shopping baskets for different categories of products: a number of different categories of products in the shopping basket, such as diapers and beer constitute a shopping basket, can say beer basket was 2, also say diaper basket factor is 2, it represents the correlation between commodities.