Prices can go up for other reasons. Let's say everybody in town got a raise. The guy at the store thinks: I want a raise too. So he adds 50 cents of profit to the cost of AB&C. People have more money, so they shrug and keep buying just as much AB&C. A manufacturer (sneakier) could put slightly less stuff in a slightly bigger box with brighter colors.
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Prices can go up for other reasons. Let's say everybody in town got a raise. The guy at the store thinks: I want a raise too. So he adds 50 cents of profit to the cost of AB&C. People have more money, so they shrug and keep buying just as much AB&C. A manufacturer (sneakier) could put slightly less stuff in a slightly bigger box with brighter colors.