Edmund Phelps
Citation: For his analysis of intertemporal tradeoffs in macroeconomic policy.
The key idea
The natural rate of unemployment is determined by structural factors (labour-market frictions, expectations), not by monetary policy. The expectations-augmented Phillips curve: there is no permanent inflation-unemployment trade-off.
The explanation
Phelps (independently of Friedman) showed that monetary expansion can lower unemployment only temporarily; once inflation expectations adjust, unemployment returns to its natural rate. His work on the natural rate of unemployment laid the foundation of NAIRU analysis.
Why Africa should care
The natural-rate hypothesis is the warning behind every African central bank's reluctance to over-stimulate. South Africa's persistently high structural unemployment is often analysed through a Phelps-style lens: it is structural, not cyclical, and monetary policy cannot fix it. Kenya's youth unemployment debate similarly turns on whether the structural natural rate is high (training, matching, labour-law issues) or whether demand-side stimulus could help.
How to use it
When debating monetary stimulus, separate cyclical from structural unemployment. Phelps's lesson: demand-side policy works only on the cyclical component; structural needs structural fixes.
Canonical works
- Edmund S. Phelps (1967) "Phillips Curves, Expectations of Inflation and Optimal Unemployment over Time" Economica
- Edmund S. Phelps (1968) "Money-Wage Dynamics and Labor-Market Equilibrium" Journal of Political Economy
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