[pvn]

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Actually, it is often the case that if the price of a product is higher, consumers don't buy as much of that product.

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This is often true. I was specifcially addressing the case where the tax is *purely* pass-through.

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And, you forget that almost all companies are consumers as well (e.g. Wal-Mart buys from a distrubitor, which buys from a manufacturer, which buys raw matierals).

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I haven't forgotten this. It doesn't have any effect on how much a tax passes through.