I believe there's a small, yet effective, means of improving the market for those of us that want to just buy a small handful of a particular item. Aren't you always frustrated to see that everyone is selling the item you want in large stacks, but all you need is like 1 or 5 of it? Now, wouldn't it be great if we could select the quantity we want to buy? You know, once you select the cheapest item, a pop up box appears and you can push an up or down arrow to select how many you want, it will calculate your total, then you'd be done. The only reason I even thought of this is because of Phantasy Star Online 2. That's basically how the shop system works in that game. Let's say you put up 999 grinders (a specific item in that game to help you grind your weapon to increase its stats). If someone only needed 20 or so though, they could access your shop (or in this case, simply find it by typing in the item name), select to buy 20, then complete their transaction. The remaining 979 would stay in the shop for others to buy as well.
I didn't find the right solution from the Internet.