i guess a readers digest version, is that if 2 products have the same usage in supply, if one has a higher price. by lowering the higher price to a lower quality, you'll save more, when you increase the other product to match.
if you want to manually supply your corps... how many products can you really manage? and keep track of, in how many countries and enterprises? if you can, enjoy.
if you contract, then you'll just set it up once, and kinda shepard it, after that. but no one wants to manually set up hundreds, or even thousand of contracts!!!
so i guess this hole thing is mute?