Past research of the accuracy of retail grocers' beliefs about consumer sea
rch and patronage behavior has found that executives tend to overestimate t
he size of the consumer segment that regularly switches stores for price sp
ecials. With surveys of consumers and executives in a large midwestern mark
et, we extend and replicate the earlier research. In this study, we find th
at executives demonstrate, on average, an accurate sense of the proportion
of consumers who are primarily loyal to one store or are shoppers of multip
le stores. However, they still tend to overestimate aggregate price compari
son behavior and cross-store shopping. At the same time, we also find that
managers simultaneously underestimate consumer newspaper readership, in-sto
re search for specials, and stockpiling. This new result suggests that the
more loyal primary customers may account for a greater proportion of increm
ental promotional sales than has been recognized in the past. These results
suggest a significant increase in the information value to be derived from
the desegregation of sales data by shopper loyalty status.