What is demand? Is it not desire?
What is the ultimate desire for? What is behind your desire of this or that? We do not desire things for their own sake. Rather our desires are expressions of a primary impulse, that is the desire for the darshan, or being in the presence, of God.
And where does supply come from? You may say it comes from this company or that government. But ultimately all supply comes from God.
So the law of demand and supply thus reformulated is the law of wholeness. It is a gestalt, parts of God (us) seeking God (the whole) while God (the whole) offers its parts (us) a chance for a reunion.
When thought of as wholeness, demand and supply make a lot of sense.