Research background: One of the principal contributions of Maynard Keynes’s General Theory was identification of the phenomenon of involuntary unemployment, due (on account of adverse expectations and confidence on the part of potential buyers) to a want of demand for the quantity of output which a fully-employed labour force was capable of producing. Such unemployment, he insisted — contrary to conventional opinion — was not due to workers pricing themselves out of work by demanding wages higher than employers could afford. Far from unemployed workers being themselves responsible for their plight, they were, in reality, victims of circumstances beyond their control. Keynes’s understanding was, for many years, widely accepted by academics...