Gil
--- Once we put aside natural monopoly, non-reproducible differences in input quality translate into different levels of average cost, so that if price equals *average* rather than *marginal* SNLT, the marginal firms will be continually driven out of business, as mentioned before. Paul ---- Why forced out of business? That would only be true if the rate of surplus value was zero. Since that is not the case, differences in costs of production merely mean that there will be a variety of different apparent rates of surplus value. Those producers useing excess labour do not have all of it count as value creating and hence appear to and I suppose in fact do, get less surplus value. But less profit is not not the same as bankruptcy.