According to historian James Livingston, Say's law aka "Hayek's theorem" has no historical support in the last 80 years. "Keynes's law" — It's the demand, stupid — is corroborated by history. Check off another myth debunked by facts.
James Livingston: Corporations Don't Need Our Savings
James Livingston, Professor History at Rutgers, is interviewed by Paul Solmon
(h/t Charles Hayden posted in MMT Deficit Owl USA Committee on FB)