Phillips Curve

Quality / Updated / COI

Quality

Reviewed

Updated

02/07/2026

Source

Citations & Trust

COI

none

TL;DR

The Phillips Curve helps assess inflation-employment trade-offs by clarifying the relationship between inflation and unemployment and the trade-offs between price stability and employment goals. It keeps scope and assumptions aligned.

Definition

The Phillips Curve describes the short-run relationship between inflation and unemployment, influenced by expectations and supply shocks. It specifies the unit of analysis and the assumptions behind that relationship, including inflation expectations and wage-setting behavior. The concept separates what is in scope (short-run trade-offs and expectation dynamics) from what is out of scope (long-run natural rate outcomes), so comparisons stay consistent. Applied well, it turns a vague debate into a measurable choice and makes the drivers of results explicit.

Decision impact

• Use the Phillips Curve to decide policy trade-offs, because it exposes inflation-unemployment dynamics and the trade-off with price stability versus employment goals.
• It changes budgeting and prioritization by making inflation expectations and wage dynamics explicit and reviewable.
• It informs adjustments when expectations de-anchor or supply shocks occur, so the decision stays grounded in current conditions.

Key takeaways

• Define the unit and time horizon before comparing inflation-unemployment dynamics across options.
• Track the primary driver (inflation expectations) separately from secondary noise.
• Run sensitivity checks on shock persistence and wage responses to avoid false precision.
• Document data sources and calculation steps so results are auditable.
• Revisit the model when the business model or market context changes.

Misconceptions

• The Phillips Curve is not stable over time; it can shift.
• It does not imply a permanent trade-off in the long run.
• Supply shocks can break the expected relationship.

Worked example

A central bank models inflation at 3% with unemployment at 4.5% and compares a slow tightening path versus a faster one. They estimate how expectations respond to a 25 bp rate increase and test supply-shock scenarios. The analysis suggests expectations are drifting, so they tighten gradually while communicating a clear target. After implementation, they monitor wage growth and survey expectations to recalibrate the curve.

Citations & Trust

• CORE Econ (The Economy)