We examine the effect of the market share of supercenter stores on consumers’ food-at-home purchasing habits in the United States. We measure healthfulness several different ways to ensure robustness, but all measurements place a greater value on fresh fruits and vegetables and whole grains than on processed foods high in sugar and sodium. The results show that consumers, on average, purchase less healthful foods at supercenters than they do at supermarkets. Moreover a one-percent increase in the local market share of supercenters results in a decrease in purchase healthfulness for groceries of 0.5 to two percent.


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