While Keynes was sceptical of the efficacy of monetary policy , the current mainstream macroeconomic consensus , "New" Keynesian macroeconomics , accords it primacy in the process of maintaining both price and output stability. This consensus depends on three relationships: demand is inversely dependent on the interest rate, inflation is positively related to the output gap and the central bank can control interest rates to achieve an optimum combination of price and output. This paper presents a theoretical critique of this consensus from an "old" Keynesian perspective since Keynes had raised fundamental objections to each of the three relationships .
