Hmm, well that would work. The incentive to 'buy out' would increase as the stack gets smaller, and for the seller it would be no loss if part of it was first bought on higher price. I still feel it doesn't matter that much though in bigger picture. Assume we're talking about mythril ore for sake of example. Assume the price has stabilized at say, about 100 gil per unit again for sake of example. You have 82 ore you want to clear from inventory. Now, you could put them up for say, 80 gil per unit, but have to buy all 82. Or you could put them up 80 gil per unit, no restriction. If it's no restriction, obviously -everyone- who buys mythril ore will buy from your 20% off stack. It should go almost instantly. If it's restricted to whole stack, then someone who wants just 3 ore for their craft, will still buy from someone else 100 per unit. Of course if we had buy orders, you would probably find buy order for 90 gil per unit, and it would all be gone at the click of 'sell'.