The term NAIRU is an acronym for Non-Accelerating Inflation Rate of Unemployment. It is a concept in economic theory significant in the interplay of macroeconomics and microeconomics. This " full employment" unemployment rate is sometimes termed the " natural rate of unemployment" or the "inflation-threshold unemployment rate": if actual unemployment falls below the NAIRU, the inflation rate is likely to rise quickly (accelerate). In terms of output, the NAIRU corresponds to potential output, the highest level of real gross domestic product that can be sustained at any one time. This is also called the " natural gross domestic product." The concept arose in the wake of the popularity of the Phillips curve which summarized the observed negative correlation between the rate of unemployment and the rate of inflation (measured as annual nominal wage growth of employees) for a number of industrialised countries with more or less mixed economies. This correlation (previously seen for the U.S. by Irving Fisher) persuaded some analysts that it was impossible for governments simultaneously to target both arbitrarily low unemployment and price stability, and that, therefore, it was government's role to seek a point on the trade-offA trade-off implies a decision to be made with full comprehension of both the upside and downside of a particular choice. The most basic trade-off in the human experience is what you do with your time. In any given period, you can focus mainly on only one between unemployment and inflation which matched a domestic social consensus.
During the 1970s in the United States and several other industrialized countries, Phillips curve analysis became less popular, because inflation rose at the same time that unemployment rose. (See stagflationStagflation is a term in macroeconomics used to describe a period of characteristic high inflation combined with economic stagnation, unemployment, or economic recession. Stagflation is thought to occur when there is an adverse shock (a sudden increase, s.) Worse as far as many economists were concerned, the Phillips curve had little or no theoretical basis. Critics of this analysis (such as Milton FriedmanMilton Friedman (born July 31, 1912) is a U. economist, known primarily for his advocacy of laissez-faire capitalism. In 1976 he was awarded the Bank of Sweden Prize in Economic Sciences in Memory of Alfred Nobel. His book Free to Choose coauthored with h and Edmund Phelps ) argued that the Phillips curve could not be a fundamental characteristic of economic general equilibriumWalras' analysis. General equilibrium theory is a branch of theoretical microeconomics. It seeks to explain production, consumption and prices in a whole economy. This article considers neoclassical approaches to general equilibrium. Investigations into t because it showed a correlation between a real economic variable (the unemployment rate) and a nominal economic variable (the inflation rate). Their counter-analysis was that government macroeconomic policy (primarily monetary policy) was being driven by a low unemployment target and that this caused expectationsIn economics, adaptive expectations means that people base their expectations of what will happen in the future based on what has happened in the past. For example, if inflation has been high in the past, people would expect it to be high in the future. of inflation to change, so that steadily accelerating inflation rather than reduced unemployment was the result. The resulting prescription was that government economic policy (or at least monetary policy) should not be influenced by any level of unemployment below a critical level - the "natural rate" or NAIRU.
If U* is the NAIRU and U is the actual inflation rate, the theory says that:
- if U < U* for a few years, inflationary expectations rise, so that the inflation rate tends to accelerate;
- if U > U* for a few years, inflationary expectations fall, so that the inflation rate tends to slow (there is disinflationDisinflation is a decrease in the rate of inflation. Being how much prices are increasing per unit of time can be expressed using the word disinflation: The slowing of the rate of inflation per unit of time. For instance in April the rate of inflation was); and
- if U = U*, the inflation rate tends to stay the same, unless there is an exogenousIn an economic model, an exogenous change is one that comes from outside the model and is unexplained by the model. For example, in the simple supply and demand model, a change in consumer tastes or preferences is unexplained by the model and also leads t shock.
Most economists do not see the NAIRU theory as explaining all inflation. Instead, it is possible to move along a short run Phillips Curve (even though the NAIRU theory says that this curve shifts in the longer run) so that inflation can rise or fall due to changes in inflation. Exogenous supply-shock inflation is also possible, as with the "energy crises" of the 1970s.
The NAIRU theory mainly intended as an argument against active Keynesian demand management and in favor of free markets (at least on the macroeconomic level). There is for instance no theoretical basis for predicting the NAIRU. Monetarists instead support the generalized assertion that the correct approach to unemployment is through microeconomic measures (to lower the NAIRU whatever its exact level), rather than macroeconomic activity based on an estimate of the NAIRU in relation to the actual level of unemployment. Monetary policy should aim instead at stabilizing the inflation rate, perhaps at zero.
