Say's law doesn't require anything.
Posted on: March 1, 2021 at 12:40:30 CT
ummmm MU
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It's just a descriptive theory that has withstood numerous attempts to disprove it, including one by Keynes (where he strawmanned what Say was saying anyway).
Demand is the desire AND ability to purchase something at a given price.
If people actually desired dog poo ice cream, then the existence of demand would still depend on whether producers could supply it at a desired price point. If producers could not do so, then there would be insufficient demand.
Say's law is not that complex, but it is more complex than your sill dog poo ice cream example.