That Keynesian economics is an approach that in the short run, mostly in times of recessions, the Gross Domestic Product (GDP) is highly influenced by aggregate demand. Total spending involves increased government expenditure and high taxation rates as well.

Following the downturn of the American investment bank (Lehman Brothers), John Maynard philosophy, the Keynesian theory, returned to relevance. Through (writings and popular press) numbers of economists advocated the implementation of Keynes theory to avoid economic collapse. The prominent feature of the Keynes economic view of government involvement in times of crisis granted the privilege.

However, Robert Lehman disregards the Keynes theory and considers it as an absolute flawed. He finds the approach as too good for a student due to its simplicity in understanding. Increase government expenditure and tax cut to combat unemployment, very simple. But in reality, the model was just theoretically and empirically deficient. The banker regards Keynes theory as a go-to for those who like government at the control of the economy.