[muzani]

It was an act of calculated generosity - buying something that wasn't really worth that much. But you can't negotiate and look generous at the same time. 5 ryo transformed the context from helping out a poor family to taking advantage of someone's poverty.

In this case, the listed price is the floor price, even though the seller agreed to less in the end. The expected price was unlisted.

With tipping, the floor price is actually higher than the listed price. Someone might agree to sell at a lower price, but below that floor price, it brings great dishonor.