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In supermarkets food is cheaper because of a few factors. One of them is the quantity of the food that is being sold- because there is so much, supermarkets have to put the price down in order to sell more. Plus, supermarkets order food in wholesale, which makes it cheaper. Another reason is because supermarkets aren’t usually private investments- often there are a few big investors, sometimes foreign, that sponsor the supermarket. The supermarket doesn’t have to worry about losing money.