What Do the Poor and the Rich Buy? In Application 4, we highlighted research showing that the nondurable goods the poor buy have gone up in price less than those purchased by the rich and that the poor buy a higher percentage of newer goods than the rich. Can you give some examples of these price differences from your experience at normal and upscale supermarkets? Visit a couple of same-industry stores such as Walmart and Whole Foods to collect data if necessary. (Related to Application 4 on page 379.)