Why have shopping carts grown steadily larger in the last three decades?
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Grocers make them bigger to get people to buy more food.
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More packaging in bulk.
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People are eating more.
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Stores are bigger, so people get more on single visits.
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People are busy with other things and make fewer shopping trips.
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People drive cars more, and peoplecan or want to fill the trunk.
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Kids are larger.
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Aisles are wider.
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Bigger houses, more storage, more capacity for bulk.
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Frozen food tastes better now.
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People use credit cards.
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It's a big world.
Look at a few:
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People are eating more. More bulk packaging. People use credit cards.
Notice: explanation takes known phenomenon in one domain (psychology of food, packaging technology, economics) and asserts simple causal connection to phenomenon being explained.
