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Phillips Curve

The short-run inverse relation between unemployment and inflation — positioned by expected inflation, sloped by how anchored those expectations are, vertical at the natural rate in the long run, and displaced by supply shocks — whose exploitable trade-off dissolves once agents come to expect the inflation.

Core Idea

The Phillips curve is the macroeconomic relationship describing a short-run inverse association between unemployment (or the output gap) and inflation: as labour markets tighten, wage and price inflation rise, and slacken in reverse. Documented empirically by Phillips and generalised by Samuelson and Solow, it became the canonical policy menu. The expectations-augmented version qualified it decisively — the trade-off exists only for surprise inflation, so the long-run curve is vertical at the natural rate, and supply shocks shift the whole curve outward.

Scope of Application

The curve organizes analysis across the subfields of macroeconomics concerned with inflation, labour markets, and monetary policy.

  • Monetary policy analysis — the operational home; the Fed dual mandate, ECB, BoJ.
  • Inflation forecasting — Phillips-curve equations in structural and New Keynesian models.
  • Labour economics — the wage-Phillips curve and the wage-price spiral.
  • NAIRU and natural-rate estimation — locating the vertical long-run asymptote.
  • Macroeconometrics and the Lucas critique — the case study in policy-conditional relations.

Clarity

Calling the relation a Phillips curve rather than "the trade-off between inflation and jobs" forces the analyst to say which curve — specifying the horizon, expectations regime, and supply conditions — which is the whole clarifying payoff. The distinction it makes legible is movement along the curve versus movement of the curve, so stagflation reads not as failure but as a supply shock shifting it outward, and the post-1990s flattening as anchored expectations compressing its slope.

Manages Complexity

A multi-decade cloud of wandering inflation-unemployment observations compresses into one shift-parametrized relation whose state reduces to four scalars: position (expected inflation), slope (anchoring), the vertical asymptote (the natural rate), and any supply-shock displacement. From those, the macroeconomist reads the qualitative outcome off a small branch structure rather than re-deriving each decade — the 1960s menu, 1970s stagflation, post-1990s flattening, and 2021 surge become the same curve under different settings.

Abstract Reasoning

The reasoning organizes around sliding along the curve versus shifting it: a diagnostic move reads an episode's source from where the scatter sits and moves, an interventionist move predicts a policy's effect by asking what it does to the curve, not just where it lands. A boundary-drawing move fixes the horizon at which the trade-off dissolves and flags the curve's reflexive non-stationarity, and an order-of-events move supplies the expectational-catch-up sequence.

Knowledge Transfer

Within macroeconomics the curve transfers as mechanism, its shift-parametrized relation and diagnostics carrying across monetary policy, forecasting, and natural-rate estimation wherever there is a labour market and a central bank. Beyond it, two parents carry the lesson: the trade_offs/pareto_efficiency family for the static inverse-relation shape, and the Lucas-critique / regime-conditional-relationship pattern for the reflexive instability. The wage-price-expectations machinery is home-bound, and invoking "a Phillips curve" for growth-versus-environment is analogy.

Relationships to Other Abstractions

Local relationship map for Phillips CurveParents appear above the current abstraction, mutual partners to the right, and children below. Node labels state whether each abstraction is prime or domain-specific; colors identify relation types.Phillips CurveDOMAINDomain-specific abstraction: Inflation — is part ofInflationDOMAINDomain-specific abstraction: Natural Rate of Unemployment — is part ofNatural Rateof UnemploymentDOMAINPrime abstraction: Trade-offs — is a decomposition ofTrade-offsPRIME

Current abstraction Phillips Curve Domain-specific

Parents (3) — more general patterns this builds on

  • Phillips Curve is part of Inflation Domain-specific

    The Phillips curve contains inflation as its vertical measured variable, expectations object, surprise term, and long-run policy outcome.

  • Phillips Curve is part of Natural Rate of Unemployment Domain-specific

    The expectations-augmented Phillips curve contains the natural rate as its vertical long-run asymptote and stable-inflation unemployment anchor.

  • Phillips Curve is a decomposition of Trade-offs Prime

    Removing wage-price vocabulary from the Phillips curve leaves a short-run inverse relation in which improvement on one desired axis costs movement on another.

Hierarchy paths (3) — routes to 2 parentless roots

Neighborhood in Abstraction Space

Phillips Curve sits in a crowded region of the domain-specific corpus (22nd percentile for distinctiveness): several abstractions share nearly its structure, so a description that fits it tends to fit its neighbors too.

Family — Macroeconomic Puzzles & Long-Run Relations (5 abstractions)

Nearest neighbors

Computed from structural-signature embeddings · 2026-07-12