lets talk about undercutters.

[Risvertasashi]

Given that the game doesn't really provide a crash course in Market Board economics, it's understandable that a large group of players will not fully understand how market trends work, or that listing a price for higher doesn't mean that it will sell less often, (assuming that it's the correct price).

Or they're trying to drive you out of the market.

I also suspect a lot of the people that complain about undercutters also list 5, 10, or more of the same item, which does more to drive down prices than anything else...