https://www.youtube-nocookie.com/embed/ysx9IEXcPd8
For more on Keynesianism, see:
Hayek and Keynes: Head to Head
Further reading:
The Upside-Down World of MMT by Robert P. Murphy
Review of Stephanie Kelton's 'The Deficit Myth: Modern Monetary Theory and the Birth of the People’s Economy' by Robert P. Murphy
Modern Monetary Theory: An Austrian Interpretation of Recrudescent Keynesianism by Patrick Newman
There’s Much Ruin in a Nation: An Analysis of Modern Monetary Theory by Mark Skousen
Modern Monetary Theory: Some Additional Dimensions by Gordon L. Brady
For more on the origin of money, see here.