Something that I've noticed recently, higher quality items are having to lower their prices so that they will be seen in the search list due to how the market search is set up. For example: If NQ cotton thread sells for 200gil each, and there are 30 people selling NQ cotton thread for 200 gil, the person who is selling Cotton thread +3 for 1k each isn't going to be in the list at all so the chances of his item selling are very low. This means that he will either have to bring his prices down to 200 or less OR sell NQ cotton thread for less than 200 so that his retainer gets noticed and this will increase his chances of selling what he intended in the beginning.
My suggestion: Adjust the search so that, upon selecting an item, a second window pops up with a list of the qualities (NQ, +1, +2, +3) then, upon selecting which quality you want, the search list will (of course) ONLY show the item for the quality that you selected, it's price and it's location.
I believe that this would help stimulate the current economy and actually get items to sell at decent prices instead of NQ and HQ having to be reasonably the same price just to sell due to a lacking search function.
Thoughts from the community?