Read the report of my investigation into this topic. It is comprehensive, and will show what I am saying beyond a reasonable doubt, or at least it has done so for the thousands that have read it so far.

Prices have nothing to do with supply and demand, or rather, you are putting the cart before the horse. A price is decided, supply is manipulated through false flag operations (or often just the illusion of "supply change" is created by propaganda), price adjusts according to the plan.