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In macroeconomic analysis, the relationship between inflation and unemployment has been a central theme in the study of stabilization policies. The origins of this discussion can be traced back to the empirical observation by A.W. Phillips in 1958, who identified a negative relationship between wage inflation and unemployment in the United Kingdom. This relationship was later generalized to price inflation and unemployment, leading to what is popularly known as the Phillips Curve. The original Phillips Curve suggested that policymakers could choose between different combinations of inflation and unemployment, implying a trade-off in the short run. However, subsequent developments in macroeconomic theory, particularly the rational expectations revolution and the natural rate hypothesis, have argued that this trade-off cannot persist in the long run. In order to explain why this is the case, it is necessary to discuss the short-run Phillips Curve, the long-run Phillips Curve, and the role of expectations, supported by an appropriate diagram. In the short run, the Phillips Curve shows an inverse relationship between inflation and unemployment. If aggregate demand rises, output increases and unemployment falls. However, this tends to raise prices, causing inflation. Thus, lower unemployment is associated with higher inflation, and conversely, higher unemployment is associated with lower inflation. Policymakers, particularly during the 1960s, interpreted this as an exploitable trade-off. Governments could supposedly target lower unemployment at the cost of tolerating some inflation, or conversely, they could control inflation by accepting higher unemployment. This was the short-run framework in which the Phillips Curve became highly influential for macroeconomic policy. However, the short-run trade-off depends critically on the assumption ______ _______ ____ _____ ___ _____ ________ __________ ____ ___.
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