Short-Run Phillips Curve Quiz: Expectations and Tradeoff

The short-run Phillips Curve is a downward-sloping curve showing that lower unemployment tends to be associated with higher inflation and higher unemployment tends to be associated with lower inflation. This relationship exists in the short run because wages and prices do not immediately adjust to changes in demand, creating a temporary tradeoff that policymakers can exploit through fiscal or monetary policy.

The answer is True. The short-run Phillips Curve holds when inflation expectations are relatively stable and do not immediately respond to policy changes or economic shifts. If expectations were to adjust instantly, the short-run tradeoff would not exist because workers and businesses would fully account for rising inflation before it affected real wages and employment, eliminating the temporary policy leverage the curve describes.

Moving down and to the right along the short-run Phillips Curve means unemployment is rising while inflation is falling. This happens when a central bank tightens monetary policy, raising interest rates to cool demand. Reduced spending leads businesses to cut production and lay off workers, raising unemployment and relieving inflationary pressure. This is the contractionary end of the short-run tradeoff.

When workers and businesses expect higher inflation, they embed those expectations into wages and prices immediately. Workers demand larger wage increases and businesses raise prices preemptively, pushing the actual inflation rate higher at every level of unemployment. This causes the entire short-run Phillips Curve to shift upward, representing a worse tradeoff where any given unemployment rate now corresponds to a higher inflation rate.

The answer is True. When the government increases spending, aggregate demand rises, encouraging businesses to expand and hire more workers. This reduces unemployment and at the same time puts upward pressure on wages and prices. This combination of falling unemployment and rising inflation represents a movement up and to the left along the short-run Phillips Curve, reflecting the short-run demand-driven tradeoff.

In the short run, wages and prices are somewhat sticky and do not adjust instantly to changes in demand. When demand rises, businesses can expand production and hire more workers before fully adjusting prices. This temporary lag allows output and employment to increase beyond the natural rate, but the effect is only short-lived. Once prices and wages fully adjust, unemployment returns to its natural level.

The short-run Phillips Curve is downward sloping, relies on stable inflation expectations, and shifts outward when the tradeoff worsens due to supply shocks or rising expectations. The claim that it holds equally in the long run contradicts the widely accepted view that the long-run relationship is vertical, meaning there is no stable inflation-unemployment tradeoff once expectations fully adjust.

The curve shifts to the right when inflation rises at every unemployment rate due to factors unrelated to demand changes. Rising inflation expectations cause workers and firms to build higher price increases into their decisions, and supply shocks raise production costs across the economy. Both factors push the inflation rate up regardless of the unemployment level, shifting the entire curve rather than moving along it.

The answer is True. When a central bank raises or lowers interest rates, it affects aggregate demand in the economy. Lower rates stimulate borrowing and spending, reducing unemployment and raising inflation, moving the economy up and to the left along the curve. Higher rates slow spending, raising unemployment and reducing inflation, moving the economy down and to the right. These are movements along the existing short-run curve.

The short-run tradeoff exists because expectations and prices are slow to adjust. Over time, workers recognize that inflation has risen and demand higher wages, firms adjust their pricing, and the temporary boost to employment fades. Once all adjustments are made, unemployment returns to its natural rate. This expectation adjustment process is why the short-run curve cannot be exploited indefinitely as a permanent policy tool.

Rightward shifts of the short-run Phillips Curve reflect a worsening tradeoff where inflation is higher at every unemployment rate. Oil price increases, deteriorating expectations, and negative supply shocks all raise inflation independently of the labor market. An increase in government spending raises demand and causes a movement along the curve rather than a shift of the curve itself.

A movement along the curve occurs when demand changes cause unemployment and inflation to move in opposite directions along the existing relationship. A shift occurs when the underlying relationship itself changes, meaning higher or lower inflation is now associated with every unemployment rate. Shifts are typically caused by supply shocks or changes in inflation expectations that alter the structural inflation environment.

The answer is True. Lower interest rates reduce the cost of borrowing, encouraging households to spend more and businesses to invest. This increase in aggregate demand raises output and leads firms to hire more workers, reducing unemployment. The stronger demand also puts upward pressure on wages and prices, raising the inflation rate. This sequence of effects illustrates how monetary easing moves the economy along the short-run Phillips Curve.

The stagflation of the 1970s was the defining challenge to the short-run Phillips Curve. Supply shocks from oil price increases raised inflation dramatically while unemployment also rose, contradicting the expected inverse relationship. This experience showed that supply-side factors could shift the curve outward, creating a worse tradeoff and undermining confidence in the curve as a reliable and stable guide for short-run policy decisions.

Wage stickiness is a core reason the short-run tradeoff exists. When demand rises, businesses can initially expand hiring without immediately facing proportionally higher wage costs because wages adjust slowly. This temporary gap between rising demand and lagging wage adjustments allows employment to increase. Over time, wages catch up with inflation, costs rise, and employment returns toward the natural rate, explaining why the tradeoff only holds in the short run.