How do you react to being undercut?

[Bape_Escape]

I wait, because eventually my listed items will sell when the undercutters aren't paying attention.

Or I package stacked mats in different quantities. If you're selling stacked mats and you're just trying to game the market board by getting your listing at the top of the list with a lower price, you'll lose money on the short game every time. If the prices is 80 for a stacked item, selling multiple stacks of 10 for 100 each will often outperform an undercutter selling a stack of 99 at 79 each. Crafters don't always want to craft a limitless volume of items so they don't always want to buy full stacks, especially in the lowbie crafted weapon mats market.

If you're undercutting the undercutters, you aren't "beating" them, you're playing their game and encouraging more undercutting. Don't feed the trolls.