Phillips curve

Phillips curve The Phillips curve is an economic concept proposing an inverse relationship between inflation and unemployment. Originating in empirical observations, it influenced Monetarism, Keynesian economics, New Classical economics debates and shaped policy in countries such as the United Kingdom, the United States, and Japan. The concept has been central to discussions involving figures and institutions like A. W. Phillips, Milton Friedman, Edmund Phelps, the Federal Reserve System, and the Bank of England.

History and origins

A. W. Phillips presented empirical findings linking wage inflation and unemployment in United Kingdom data, prompting attention from economists at institutions including the London School of Economics, the University of Cambridge, and the Bank of England. Early reception intersected with debates involving John Maynard Keynes proponents at the Keynesian Revolution and critics associated with Chicago School economists such as Milton Friedman. Policymakers in the United Kingdom and the United States referenced the relationship during the Post–World War II economic expansion and in discussions at the International Monetary Fund and Organisation for Economic Co-operation and Development meetings. Subsequent theoretical reinterpretations emerged from scholars at the University of Chicago, Columbia University, and Princeton University.

Theoretical foundations

The original empirical observation suggested a trade-off framed by wage dynamics and labor market tightness, linking work by Phillips to labor economists at Oxford University and researchers studying the Great Depression. Theoretical refinements invoked expectations from analyses by Milton Friedman and Edmund Phelps, who introduced the roles of adaptive expectations and rational expectations developed further in models at MIT, Stanford University, and Harvard University. New Classical models incorporated microfoundations from search and matching theory advanced at London School of Economics and European University Institute, connecting to wage-setting frameworks studied by scholars at Yale University and Northwestern University. Theoretical constructs employed by central banks such as the Federal Reserve Bank of New York and the European Central Bank integrated versions of the relationship into policy rules discussed in seminars at International Monetary Fund and Bank for International Settlements forums.

Empirical evidence and variants

Empirical work testing the relationship used data from national statistical offices in the United States, United Kingdom, Germany, France, Japan, Canada, Australia and emerging markets studied at World Bank workshops. Variants include the expectations-augmented version associated with Milton Friedman and Edmund Phelps, the New Keynesian Phillips Curve developed in models from Carnegie Mellon University, New York University, and Princeton University, and versions incorporating wage Phillips relationships explored by researchers at University of Chicago and Columbia University. Time-series studies utilized techniques from scholars at University of California, Berkeley and London Business School, with structural breaks identified in events such as the 1973 oil crisis, the 1979 energy crisis, and the Volcker disinflation. Panel studies covered regions including the European Union, Latin America, East Asia, and Sub-Saharan Africa, engaging researchers affiliated with the Inter-American Development Bank, Asian Development Bank, and Organisation for Economic Co-operation and Development.

Policy implications and debates

The perceived trade-off informed macroeconomic stabilization policy at institutions like the Federal Reserve System, the Bank of England, the European Central Bank, and the Bank of Japan, influencing leaders such as Paul Volcker, Alan Greenspan, Mervyn King, and Haruhiko Kuroda. Debates pitted advocates of activist demand management associated with Keynesian economics against proponents of rules-based approaches linked to Monetarism and New Classical economics. Theories influenced legislative and executive discussions in bodies like the United States Congress, the Treasury of the United Kingdom, and international gatherings at the G7 and G20. Central bankers used variants of the relationship when communicating inflation targets established following frameworks promoted by the International Monetary Fund and the Bank for International Settlements.

Criticisms and limitations

Critics highlighted breakdowns during episodes such as the stagflation of the 1970s, the Great Inflation in the United States, and persistent low inflation in the Eurozone and Japan in the 1990s and 2000s. Methodological critiques emerged from econometricians at University of Chicago, Massachusetts Institute of Technology, and London School of Economics who emphasized issues of data quality, structural change, and expectations formation observed in studies by researchers at National Bureau of Economic Research and Centre for Economic Policy Research. Alternative frameworks drew on labor-market institutions studied at Organisation for Economic Co-operation and Development and on wage-setting mechanisms analyzed by scholars from International Labour Organization and World Bank. Contemporary research at University of Pennsylvania, University of Michigan, and Columbia University continues to examine supply shocks, anchoring of expectations, and measurement challenges in consumer price indices produced by national agencies such as the Office for National Statistics and the Bureau of Labor Statistics.

Category:Macroeconomics