Because "make things the cheapest" implies: (a) more people having access to more, better products for cheaper (b) the people making those things ipso facto p

Because "make things the cheapest" implies: (a) more people having access to more, better products for cheaper (b) the people making those things ipso facto prefer to be doing those jobs over alternatives (c) if other people were previously making similar things less efficiently, they are now freed up to do something else