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I suspect this also the same for men. In general people don't actually know what they want.

That kinda defeats the purpose of inflation though. Part of why Keynes was in favor of some inflation was to diffuse the effect of sticky wages, if that's the case you don't want t…

Lots of bars have "regulars" that they give unadvertised discounts too. This isn't an unsolved problem, you don't even need to go as far as coupons.