IESET.
Hypotheses·growth·volcker_disinflation_output_recovery

Volcker's 1979–1982 disinflation produced output recovery by 1984 once inflation expectations re-anchored, vindicating the monetarist claim that credible rule-based tightening imposes finite transition costs.

SUPPORTEDengine/runs/volcker_disinflation_output_recovery

SUPPORTED — CPI YoY fell from 14.4% peak (1980Q2) to 3.2% in 1983Q4 (drop = 11.2pp, threshold >= 5.0pp; level threshold <= 5.0%). Real GDP at 1984Q4 was -1.9% relative to the 1972Q1-1979Q3 linear log-time trend (recovery threshold >= -2.0%). Both primaries cleared.

confidence cueThis is a clear pass for the claim as written. It still applies only to this sample, period, and method.

policy briefClear support

In ordinary language

Over a long period, do more market-oriented institutions translate into higher income or productivity, once the comparison looks beyond a single success story?

plain answer

The data clearly moved in the predicted direction. CPI YoY fell from 14.4% peak (1980Q2) to 3.2% in 1983Q4 (drop = 11.2pp, threshold >= 5.0pp; level threshold <= 5.0%).

why it matters

Growth claims can look convincing in single success stories. This test asks whether the pattern survives a broader comparison.

how the test works

It compares 1 country or place units from 1979 to 1987, using a event study design, with fixed effects for year.

what was measured
What we checked
  • Inflation cpi
  • Real income
  • Federal funds rate
what this does not prove

A single test is not the whole truth. It narrows the claim under a specific sample, time period, and method. Strong policy conclusions need the pattern to survive nearby tests, alternative data, and serious objections.

verification

3 input datasets, 0 unresolved missing series, provenance status: reproducible hash verified.

Results

engine/runs/volcker_disinflation_output_recovery
1007550250197919831987USA
illustrative sketch · run pending
No coefficients yet. When the model fires, this chart will show inflation_cpi across 1 sampled countries over 1979–1987.
The shapes above are stylised — none of the lines are real data.
Placeholder for volcker_disinflation_output_recovery. Published chart will be generated from engine/runs/volcker_disinflation_output_recovery/chart_data.json.

Who has skin in the game — schools predicting on this

3 schools list this hypothesis as a test of their position. The chips below are school-level scoreboard outcomes, not a second hypothesis verdict.

hypothesis verdict vs scoreboard outcome

The banner verdict judges this hypothesis as written. The scoreboard asks whether each school's polarity-corrected prediction was right. Raw status is not a school win: SUPPORTED supports schools that needed SUPPORTED, but refutes schools that needed REFUTED.

Chicago School Monetarismwins if SUPPORTEDschool supportedEmpirical Pragmatist (the framework's house position)wins if SUPPORTEDschool supportedNew Keynesian (mainstream synthesis)wins if MIXEDpartial/no-call

Pre-registration

pre-registered
first-spec commit 4c8ce8e · 2026-07-18T22:11:21Z

Volcker's 1979–1982 disinflation produced output recovery by 1984 once inflation expectations re-anchored, vindicating the monetarist claim that credible rule-based tightening imposes finite transition costs.

Falsification criterion — what would disprove this

set before the run · honoured after

This hypothesis is considered falsified if:

PRIMARY (dispositive): the hypothesis is SUPPORTED iff BOTH (a) headline CPI YoY inflation falls from its 1979-1980 peak to a 1983Q4 quarterly mean of at most 5.0% (Volcker disinflation magnitude — a fall of >= 5pp from the >=10% peak), AND (b) real GDP (GDPC1) returns to its pre-1979 trend by 1984Q4 (i.e. the log-gap of 1984Q4 real GDP relative to the linear log-time fit estimated on 1972Q1-1979Q3 is >= -2.0%, treating "returned to trend" as within 2% of the extrapolated trajectory). REFUTED if EITHER (i) the inflation drop from peak to 1983Q4 is < 5pp (no disinflation), OR (ii) the 1984Q4 real-GDP gap to pre-1979 trend is <= -5.0% (output failed to recover, large permanent loss). Otherwise PARTIAL. INFORMATIVE (non-gating): the level of the effective fed funds rate at the 1981 peak (treatment intensity), inflation YoY trajectory between peak and 1983Q4, and trough-to-1984Q4 GDP recovery slope. METHOD_VALID: requires CPIAUCSL, GDPC1, FEDFUNDS all loaded for the 1972Q1-1984Q4 window. If any series is missing, emit `inconclusive (data gap)`.

formal test & threshold
test:      volcker_event_study_1979Q4_disinflation_recovery_dual_threshold
threshold: PRIMARY: cpi_yoy_1983Q4_mean <= 5.0% AND (peak_cpi_yoy - cpi_yoy_1983Q4_mean) >= 5.0pp AND log(real_gdp_1984Q4) - trend_log_1984Q4 >= -0.020. REFUTED gate: (peak_cpi_yoy - cpi_yoy_1983Q4_mean) < 5.0pp OR log(real_gdp_1984Q4) - trend_log_1984Q4 <= -0.050.

Method

Template
event_study
Fixed effects
year
Clustering
none
Sample
1 countries · 1979 – 1987
Evidence type
associational

Single-country US event study around the October 1979 Volcker tightening. Outcomes: inflation, real GDP growth, output gap. Tests whether inflation re-anchored and real output recovered to trend by 1984, consistent with the monetarist credibility-with-finite-cost claim.

Data

VariableSourceTransform
inflation_cpi
outcome
fred:CPIAUCSLtier 1
—
real_gdp
outcome
fred:GDPC1tier 1
—
federal_funds_rate
outcome
fred:FEDFUNDStier 1
—

● ready  · ● pending  · ● reconstruct-needed

Detailed result card

Volcker disinflation output recovery

Verdict: SUPPORTED — CPI YoY fell from 14.4% peak (1980Q2) to 3.2% in 1983Q4 (drop = 11.2pp, threshold >= 5.0pp; level threshold <= 5.0%). Real GDP at 1984Q4 was -1.9% relative to the 1972Q1-1979Q3 linear log-time trend (recovery threshold >= -2.0%). Both primaries cleared.

Summary

  • Sample: USA quarterly, 1972Q1-1984Q4 with 1972-1979Q3 pre-trend.
  • Event: 1979-10 Volcker FOMC tightening (effective fed funds peaks at 17.8% in 1981Q2).
  • CPI YoY: peak 14.4% (1980Q2) -> 3.2% in 1983Q4. Drop = 11.2pp (threshold >= 5.0pp). Disinflation primary PASS.
  • Real GDP (GDPC1) at 1984Q4 = -1.9% vs the linear log-time trend fit on 1972Q1-1979Q3 (pre-trend growth ~ 3.16%/yr). Threshold for recovery: gap >= -2.0%. Recovery primary PASS.
  • Recession trough (largest negative gap to trend, 1980-1983): -8.6% in 1982Q4.

Method

  1. CPI YoY = 12-month log-difference of monthly CPIAUCSL, aggregated to quarterly mean.
  2. Peak CPI YoY identified within 1979Q1-1981Q4 (the Volcker-era peak window).
  3. Real-GDP trend = OLS linear fit of log(GDPC1) on time-index (quarters since 1972Q1) over 1972Q1-1979Q3, then extrapolated.
  4. 1984Q4 gap = log(GDPC1_1984Q4) - extrapolated_trend_1984Q4.
  5. SUPPORTED iff (1983Q4 CPI YoY <= 5% AND peak-to-1983Q4 drop >= 5pp) AND (1984Q4 trend gap >= -2%). REFUTED if drop < 5pp OR gap <= -5%.

Caveats

  • Pre-trend window includes both 1973 and 1979 oil-price shocks, so the estimated 1972-79 trajectory is dragged down by them. This is conservative for the recovery claim: a 'no-shock' counterfactual trend would be steeper, making the 1984Q4 gap larger (more negative). Hypothesis is therefore tested against an easy benchmark.
  • Volcker tightening is bundled with Reagan tax cuts (1981 ERTA) and the 1980 / 1981-82 recessions. The event-study identifies the joint macro outcome, not the pure monetary-policy effect. The Romer-Romer narrative-shock decomposition would be required to isolate.
  • Single-country analysis: no cross-country counterfactual to a country that did not tighten. The result is a within-US time-series test of the disinflation-with-recovery pattern.

Data

  • fred:CPIAUCSL — US headline CPI (monthly).
  • fred:GDPC1 — US real GDP, chained (quarterly).
  • fred:FEDFUNDS — US effective federal funds rate (monthly).

Strongest opposing argument

Every hypothesis ships with its charitable opposing argument. The framework earns credibility by handling objections at their strongest, not weakest.

Notes

Stub seeded from monetarist, New-Keynesian, and empirical-pragmatist predictions about Volcker disinflation output recovery. Multiple cross-school links require careful event-window specification.

Authored framework. Read the transparency note.