From the Keynesians' perspective, a short-run Phillips Curve exists because

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According to Keynesians, wages are sticky or inflexible in the short run, meaning that they do not adjust immediately to changes in the price level. As a result, when the price level rises, firms may reduce employment, which leads to a decrease in output and an increase in unemployment. This relationship between inflation and unemployment is known as the Phillips Curve.

From the Keynesians' Perspective, a Short-Run Phillips Curve Exists Because