>Take away the cheapest materials, demand goes up for the next-cheapest and pretty soon it's not cheap anymore This is why I didn't even mention wool. It's not

>Take away the cheapest materials, demand goes up for the next-cheapest and pretty soon it's not cheap anymore This is why I didn't even mention wool. It's not so expensive now, but if PETE was gone, surging demand for wool would quickly make it very expensive.