How do you react to being undercut?

[waca]

And does anyone ever consider that people are manipulating the market to obtain cheep items. I have done this list an item for a super low price watch others under cut, then buy out the market use those mats and sell your own later at a price to cover your costs. It works great.

People constantly manipulating price of certain materia.

example: This was sold with 4.5k gil last night when i went to bed.