by Richard Volpe, Annemarie Kuhns, and Ted Jaenicke USDA Economic Research Service What Is the Issue? Americans are buying more and more of their “food at home,” or groceries, from stores that are not conventional supermarkets. According to Nielsen Homescan data, U.S. households spent 80 percent of their grocery dollars at traditional supermarkets in 1999 but only 62 percent there …