Okay, I actually have an idea of how to implement it
Say you have a shop, you could register it on the forums or whatever. With that say 1000 shares are given out based on the value of the shop. IE trackable figures like amount of transactions occurred and however many people had done the pwarp to the shop. With that the shares would then be set at a price. If the figures rise, the stock value would rise but if they begin to taper off, than the stock amount would taper off.
