Hi, Sometimes no difference is intended, particularly in business and economics-related English . But note that the retail business, ie stores, usually speaks of customers. Here's the very broad difference.
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soheil1And you are not normally a consumer of groceries?You misunderstand. I wrote "You are a consumer of various goods and services". Groceries are included under the heading of "goods". So yes, we are consumers of groceries - and consumers of lots of other things as well.