Eh, not completely true. There is an activity on Wall Street called "short selling": basically, you "borrow" shares of a dropping stock from a broker or another source, and you sell the stock, and buy it back after it has fallen. You return the stock and pocket the difference. I'm sure the same thing could be [riskily] done with the Grand Exchange: a whole bunch of BGS owners could sell minimum, and once all of their swords are sold and the price is lower, they can buy back, and they'll have cash and their old sword.