New Keynesian Economics

New Keynesian Economics builds upon the foundational ideas of John Maynard Keynes but introduces several key principles that address perceived limitations of classical Keynesian theory. It emphasizes the importance of microeconomic foundations in macroeconomic modeling. Unlike classical Keynesian theory, which often used aggregate relationships without specifying individual behaviors, New Keynesian models incorporate rational expectations. This means that individuals and firms are assumed to make decisions based on all available information and economic fundamentals. This microfoundation helps to make the model more consistent with observed economic behavior. Rational expectations also imply that government policies, such as changes in fiscal or monetary policy, may have less predictable effects on the economy, as agents anticipate and adjust to policy changes more quickly.

One of the main criticisms of classical Keynesian theory was its assumption of fully flexible prices and wages. New Keynesian Economics relaxes this assumption by incorporating the idea of price and wage stickiness. It acknowledges that in the real world, prices and wages do not adjust instantaneously to changes in demand and supply conditions. This sticky price and wage assumption helps explain why changes in aggregate demand, such as government spending or monetary policy, can have short-term effects on output and employment. It introduces the concept of nominal rigidities, where prices and wages do not adjust immediately, leading to fluctuations in output and employment in response to shocks.

New Keynesian Economics also provides a framework for analyzing optimal monetary policy. It introduces the idea that central banks can use monetary policy to stabilize the economy by influencing the nominal interest rate. Central banks can adjust interest rates in response to changes in economic conditions to achieve their dual mandate of price stability and full employment. By setting an optimal path for the nominal interest rate, central banks can mitigate the impact of shocks to the economy and minimize fluctuations in output and inflation. This approach contrasts with classical Keynesian views that often advocated for discretionary fiscal policy as the primary tool for stabilizing the economy.

In summary, New Keynesian Economics builds upon classical Keynesian theory by incorporating microfoundations, rational expectations, sticky prices and wages, and a focus on optimal monetary policy. These principles help address perceived limitations of classical Keynesian theory, such as its lack of microeconomic foundations and its simplistic treatment of price and wage adjustment. New Keynesian models provide a more rigorous and realistic framework for understanding how the economy responds to shocks and how policymakers can use monetary policy to achieve macroeconomic stability.

Reference

Academic.oup.com. (n.d.). https://academic.oup.com/oxrep/article/34/1-2/70/4781816 

Citation management: Permanently linking to content on JSTOR. (n.d.-a). https://support.jstor.org/hc/en-us/articles/115004872507-Citation-Management-Permanently-Linking-to-Content-on-JSTOR 

Liberto, D. (n.d.). New keynesian economics: Definition and vs. keynesian. Investopedia. https://www.investopedia.com/terms/n/new-keynesian-economics.asp 

The new keynesian economics and the output-inflation trade-off - brookings. (n.d.-b). https://www.brookings.edu/wp-content/uploads/1988/01/1988a_bpea_ball_mankiw_romer_akerlof_rose_yellen.pdf