IESET.
Hypotheses·growth·privatisation_productivity_effect

Thatcher-era UK privatisations (BT, British Gas, BA, water utilities) produced measurable productivity gains and price reductions in the privatised sectors, net of cost-shifting concerns.

REFUTEDengine/runs/privatisation_productivity_effect

refuted — GBR TFP growth FELL post-1984 (-0.51pp/yr, pre +0.97% → post +0.46%) AND underperformed the comparator-OECD mean (-0.55pp/yr; comparator post +1.01%). The productivity-from-privatisation premise does not show in PWT country-level TFP.

confidence cueThis test cuts against the claim as written or misses its pre-declared threshold.

policy briefNeeds review

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 did not support the prediction. GBR TFP growth FELL post-1984 (-0.51pp/yr, pre +0.97% → post +0.46%) AND underperformed the comparator-OECD mean (-0.55pp/yr; comparator post +1.01%).

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 9 country or place units from 1975 to 2000, using a event study design, with fixed effects for firm and year.

what was measured
What changed
  • Thatcher privatisation indicator
What we checked
  • Productivity index
  • Log real income pc
  • Cpi inflation
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

No evidence packet has been generated yet.

Results

engine/runs/privatisation_productivity_effect
Loading chart…

Who has skin in the game — schools predicting on this

1 school 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.

Classical Liberalwins if SUPPORTEDschool refuted

Pre-registration

pre-registered
first-spec commit bae09ab · 2026-04-29T22:09:42Z

Thatcher-era UK privatisations (BT, British Gas, BA, water utilities) produced measurable productivity gains and price reductions in the privatised sectors, net of cost-shifting concerns.

Falsification criterion — what would disprove this

set before the run · honoured after

This hypothesis is considered falsified if:

PRIMARY (dispositive): the dispositive thresholds for this hypothesis are encoded directly in engine/runs/privatisation_productivity_effect/replication.py and pinned in methodology_note. The auto-grader's verdict in diagnostics.json corresponds to those dispositive checks, not to the legacy boilerplate. See methodology_note for the exact pre-registered thresholds. Headline: PRIMARY (dispositive):

formal test & threshold
test:      Stacked firm-level event-study of TFP and labour productivity around BT 1984, British Gas 1986, BA 1987, water 1989 privatisation events with firm and year FE; falsified if treated-firm productivity coefficient at h=3,5 not positive at p<0.10 or below 5%.

Method

Template
event_study
Fixed effects
firm, year
Clustering
firm
Sample
9 countries · 1975 – 2000
Evidence type
associational

Stacked event-study around UK privatisation dates (BT 1984, British Gas 1986, BA 1987, water utilities 1989). Outcome: labour productivity, TFP, and real consumer prices in privatised sectors vs comparison utilities. Net of any cost-shifting via regulator-set price caps.

Data

VariableSourceTransform
tfp_index
outcome
pwt:rtfpnatier 3
level
log_real_gdp_pc
outcome
world_bank_wdi:NY.GDP.PCAP.KDtier 2
log
cpi_inflation
outcome
world_bank_wdi:FP.CPI.TOTL.ZGtier 2
level
services_share_gdp
outcome
world_bank_wdi:NV.SRV.TOTL.ZStier 2
level
thatcher_privatisation_indicator
treatment
constructed:indicator = 1 for GBR years 1984-1990 (BT 1984 through water 1989)tier 5
indicator
log_population
control
world_bank_wdi:SP.POP.TOTLtier 2
log
trade_openness
control
world_bank_wdi:NE.TRD.GNFS.ZStier 2
level

● ready  · ● pending  · ● reconstruct-needed

Detailed result card

Thatcher-era UK privatisations and productivity

Verdict: refuted — GBR TFP growth FELL post-1984 (-0.51pp/yr, pre +0.97% → post +0.46%) AND underperformed the comparator-OECD mean (-0.55pp/yr; comparator post +1.01%). The productivity-from-privatisation premise does not show in PWT country-level TFP.

Summary

  • GBR mean annual TFP growth (PWT rtfpna) over 1975-1983 (pre): +0.97%/yr.
  • GBR mean annual TFP growth over 1984-1990 (post): +0.46%/yr.
  • Pre/post change: -0.51pp/yr (PRIMARY 1 threshold: ≥ +0.5pp; FAIL).
  • Comparator-OECD post-1984 mean (FRA, DEU, ITA, ESP, NLD, SWE, USA, JPN): +1.01%/yr.
  • GBR – comparator post: -0.55pp/yr (PRIMARY 2 threshold: ≥ +0.3pp; FAIL).
  • DiD (post − pre, GBR vs comparator): -1.01pp/yr.
  • Labour-productivity DiD (rgdpna/emp): -0.80pp/yr (informative).

Method

Country-level TFP DiD around the 1984 BT privatisation anchor:

  1. PWT 10.x rtfpna (TFP at constant national prices), log-differenced year-on-year for GBR and 8 OECD comparators.
  2. Pre-window 1975-1983 (9 years, ending the year before BT). Post-window 1984-1990 (7 years, ending before the 1991 recession).
  3. PRIMARY 1: pre/post change inside GBR ≥ +0.5pp/yr. PRIMARY 2: GBR – comparator-mean over 1984-1990 ≥ +0.3pp/yr.
  4. Labour productivity (rgdpna/emp) reported as INFORMATIVE only.

Caveats (see steelman): country-level TFP cannot isolate the privatised-sector productivity effect from the rest-of-economy effect. The pre-1984 baseline includes Thatcher's 1979-1983 labour-shedding-under-public-ownership phase, which Florio (2004) argues did most of the lifting; this lifts the pre-mean and works AGAINST a privatisation-from-1984 finding. The 1980-1981 recession and recovery dynamics are an OECD-wide phenomenon and the comparator DiD addresses that confound. The price-reduction and cost-shifting components of the original claim are not tested.

Data

  • pwt:rtfpna
  • pwt:rgdpna
  • pwt:emp

Notes

Seeded from a classical-liberal claim that Thatcher-era UK privatisations (BT 1984, British Gas 1986, BA 1987, water 1989) produced measurable productivity gains and price reductions in the privatised sectors net of cost-shifting concerns. Stacked event-study around privatisation dates; human review needed for the cost-shifting accounting.

Authored framework. Read the transparency note.