A rapidly expanding money supply, for example, sends out false signals to investors who then make malinvestment which later show up as idle capacity. Countries that are inflating flood the money markets with their currencies causing fluctuations, current account problems and expectations of changing interest rates, of tightening or loosening money supplies which creates intense speculative activity as market participants try to out guess central banks. Soros, for instance, did not sink the pound, the British Government did that when it decided to inflate on a fixed exchange rate. This enabled Soros to enrich himself by anticipating the consequences. Of course it isn't.
Supply is the obverse of demand.
He and Cox are clearly well matched in their general ignorance and economic illiteracy. Ota Sik's warning to Dubcek that you defy the market at your peril has no meaning for this pair. The worrying thing is that Cox' and Tanner's economic idiocy is being taken seriously by some members of the Labour Party. Mutual admiration is no substitute for action.