Why a tight labor market can push prices up
When unemployment is low, employers may have to compete harder for workers. Faster wage growth can give households more to spend, while raising the cost of producing goods and services. If businesses pass some of those costs on, inflation can rise. When unemployment is higher, workers may have less bargaining power and consumers may spend less, easing some pressure on wages and prices.
The Phillips curve is a way to describe this possible relationship—not a machine that predicts prices from the unemployment rate. It focuses on how much pressure demand and labor costs place on the economy over a particular period.
Why the relationship can shift
The tradeoff is not fixed. People’s expectations matter: if workers and businesses anticipate continued inflation, workers may seek larger raises and firms may raise prices sooner, helping inflation persist even as unemployment changes. If expectations remain steadier, the same labor-market conditions may produce a different inflation response.
Inflation can also rise for reasons that unemployment does not explain, such as a sudden increase in the cost of important inputs. In that case, prices may climb even while hiring weakens. Such disruptions make the simple inverse pattern harder to see.
What policymakers can—and cannot—use it for
Central banks watch employment and inflation together because actions that cool price pressures can also reduce demand for workers. Higher interest rates, for example, can make borrowing more expensive and slow spending; that may ease inflation, but it can also weaken hiring. The curve helps frame that tension, but it does not specify a safe unemployment rate or guarantee how much inflation will change.
That is why a jobless-rate reading alone cannot tell policymakers whether prices are about to accelerate. They must also judge wage growth, expectations, and the source of price increases—distinguishing an overheated economy from a supply disruption that calls for a different response.
