A Simple Example From Dynamic Hedging

Why is it obvious that there has to be a scale, a measure of value? You cannot enforce the law of one price if if you don't have one unit bywhic you are valuing everything else. But let me tell you the complication that two people can be acting, each one having a different currency and strange thing in the distribution of these two will not be symmetric. And when we price options between two different people, ok, the same equation doesn't s you don't get the same price, ok? I don't.