Modern central banking practice relies heavily on New Keynesian Monetary Economics. This framework builds on classical principles but integrates microeconomic realities like market imperfections, monopolistic competition, and sticky pricing models. [1]
Price Stickiness and the Monetary Transmission Window
If all prices and wages adjusted instantly, monetary adjustments would have no impact on real economic indicators. New Keynesian theory proves that because of Menu Costs—the physical and administrative costs corporations incur to change their prices—and long-term employment contracts, prices adjust slowly across the economy.
  Economic Model Type |   Price Adjustment Speed      |   Short-Term Monetary Impact
----------------------+-------------------------------+-----------------------------------------
  Classical Monetarism | Instantaneous adjustments      | Pure nominal changes; zero real impact
  New Keynesian        | Sticky pricing / Menu costs  | Shifts real interest rates & output gaps

Because of this price stickiness, changes in the nominal policy interest rate shift the short-term real interest rate, opening a window where central bank choices influence real economic output and employment levels.
 
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