| Abstract: | Instead of making value-price comparisons for all members of a product set, consumers may decide to adopt simple purchase decision rules such as larger sizes are better buys. When the unit price of a larger size is greater than the unit price of a smaller size, a quantity surcharge exists. Previous research has established that consumers do frequently encounter quantity surcharges in purchasing grocery products. However, estimates of the amount of the surcharge, the goal of this research, have not previously been reported. In this study the expected return from using the larger-size rule was estimated. The estimation procedure made use of price and size information gathered for all available packages of 23 products sold in 15 grocery stores in one rural Illinois community in October 1981. Nineteen of the 23 grocery products were found to have surcharges, with the mean amount ranging from less than one cent to 65 cents. Tuna fish was the only product for which the expected value of the return from buying a larger size rather than a smaller size was negative. Implications for consumers' choice of shopping strategies are discussed. |
