Large sizes at the supermarket, I think, are simply because Americans shop maybe once a week at the supermarket while Europeans will shop everyday or every othe

Large sizes at the supermarket, I think, are simply because Americans shop maybe once a week at the supermarket while Europeans will shop everyday or every other day. This is because Americans will typically drive to the supermarket and can carry a lot of stuff home, while Europeans will take public transport or walk, and can't carry as much. Additionally houses in Europe are a lot smaller and they just don't have room to store so much, while in America houses tend to be larger (at least if you're not in a dense city).