One-gil undercutters are the sole reason markets spiral downward.

[Merhouse]

I'd rather deal with people undercutting by 1 gil than people undercutting by 20% or more of the price. 1 gil undercutting is a slight nuisance and barely any money lost. Undercutting by 20% or more is a big loss of profits and is far more annoying, especially if you had just set the lowest price a few hours prior.

One gil undercutters are the much bigger problem because they cause the 20k undercutters