Pre-registration
Nordic persistent outcome advantages (GDP per capita, Gini disposable income, unemployment) over comparable high-welfare Southern European economies over 1996-2023 are substantially explained by a decomposable set of institutional, market-economy, and fiscal-discipline features — specifically government effectiveness, rule of law, and debt-to-GDP ratio — rather than by welfare architecture or Nordic-specific cultural factors alone. Country-specific residuals after channel controls and country fixed effects should account for a minority of the raw Nordic-vs-Southern-Europe outcome gap.
Falsification criterion — what would disprove this
This hypothesis is considered falsified if:
Not supported if the Nordic-dummy coefficient after including the three decomposition channels (government effectiveness, rule of law, debt/GDP) plus country and year fixed effects remains greater than 30 percent of the raw Nordic-dummy coefficient (pre-channel) across all three outcome specifications. A large residual would indicate Nordic-specific factors beyond the measured channels are doing most of the explanatory work, and the hypothesis — that decomposable institutional features explain the gap — would be weakened. A clean finding requires channels to absorb at least 70 percent of the raw gap on the primary outcome (log GDP per capita PPP) and at least 50 percent on the other two.
formal test & threshold
test: nordic_dummy_residual_share_across_outcomes threshold: residual_share(gdp_pc_ppp) <= 0.30 AND residual_share(gini) <= 0.50 AND residual_share(unemployment) <= 0.50
Method
- Template
panel_fe_decomposition- Fixed effects
country, year- Clustering
country- Sample
- 10 countries · 1996 – 2023
- Evidence type
- causal
Specification: outcome = b0 + b1*GovEff + b2*RuleOfLaw + b3*DebtGDP + b4*log(pop) + b5*urbanisation + alpha_i (country FE) + gamma_t (year FE) + epsilon. Driscoll-Kraay SEs clustered by country to handle cross- sectional dependence. Decomposition step: re-estimate on Nordic-vs- Southern-Europe dummy panel without channels vs with channels; report how much of the raw Nordic-indicator coefficient the channels absorb. Known channel omissions for v1: OECD EPL (labour market flexibility) and WVS/V-Dem social trust measures are not yet fetcher-ready. These are acknowledged in the falsification rule — a large residual in v1 is compatible with either the hypothesis being weak OR the missing channels being important. A v2 spec adds these once the fetchers ship and reports whether the residual collapses. Norway's SWF mechanism is absorbed into the Norway country fixed effect rather than modelled as a channel variable; the hypothesis does not claim the SWF's contribution is separable from Norway's country-specific time-invariant features at v1.
Data
| Variable | Source | Transform |
|---|---|---|
gdp_per_capita_ppp_constant outcome | world_bank_wdi:NY.GDP.PCAP.PP.KDtier 2 | log |
gini_disposable_income outcome | world_bank_wdi:SI.POV.GINItier 2 | level |
unemployment_rate outcome | world_bank_wdi:SL.UEM.TOTL.ZStier 2 | level |
government_effectiveness channel | wgi:GOV_WGI_GE.ESTtier 4 | level |
rule_of_law channel | wgi:GOV_WGI_RL.ESTtier 4 | level |
debt_to_gdp channel | world_bank_wdi:GC.DOD.TOTL.GD.ZStier 2 | level |
log_population control | world_bank_wdi:SP.POP.TOTLtier 2 | log |
urbanisation control | world_bank_wdi:SP.URB.TOTL.IN.ZStier 2 | level |
● ready · ● pending · ● reconstruct-needed
Detailed result card
Result card — nordic_outcome_persistence_decomposition
Verdict: PARTIAL — coef=+0.0003551, p=0.993 (above α=0.1); direction inconclusive
Pre-registration
- Claim: Nordic persistent outcome advantages (GDP per capita, Gini disposable income, unemployment) over comparable high-welfare Southern European economies over 1996-2023 are substantially explained by a decomposable set of institutional, market-economy, and fiscal-discipline features — specifically government effectiveness, rule of law, and debt-to-GDP ratio — rather than by welfare architecture or Nordic-specific cultural factors alone. Country-specific residuals after channel controls and country fixed effects should account for a minority of the raw Nordic-vs-Southern-Europe outcome gap.
- Falsification rule: Not supported if the Nordic-dummy coefficient after including the three decomposition channels (government effectiveness, rule of law, debt/GDP) plus country and year fixed effects remains greater than 30 percent of the raw Nordic-dummy coefficient (pre-channel) across all three outcome specifications. A large residual would indicate Nordic-specific factors beyond the measured channels are doing most of the explanatory work, and the hypothesis — that decomposable institutional features explain the gap — would be weakened. A clean finding requires channels to absorb at least 70 percent of the raw gap on the primary outcome (log GDP per capita PPP) and at least 50 percent on the other two.
- Falsification test: nordic_dummy_residual_share_across_outcomes
Estimate
- Method: linearmodels.PanelOLS
- Coefficient (treatment): +0.0003551
- Std error: 0.04013
- p-value: 0.993
- Observations: 200, countries: 8
- Within R²: 0.108
- Fixed effects: entity=True, time=True
- Clustering: country
Variables resolved
world_bank_wdi:NY.GDP.PCAP.PP.KD→ gdp_per_capita_ppp_constant (outcome, publisher=world_bank_wdi, n=8325)world_bank_wdi:SI.POV.GINI→ gini_disposable_income (outcome, publisher=world_bank_wdi, n=2430)world_bank_wdi:SL.UEM.TOTL.ZS→ unemployment_rate (outcome, publisher=world_bank_wdi, n=6874)wgi:GOV_WGI_GE.EST→ government_effectiveness (decomposition_channels, publisher=wgi, n=5168)wgi:GOV_WGI_RL.EST→ rule_of_law (decomposition_channels, publisher=wgi, n=5296)world_bank_wdi:GC.DOD.TOTL.GD.ZS→ debt_to_gdp (decomposition_channels, publisher=world_bank_wdi, n=1788)world_bank_wdi:SP.POP.TOTL→ log_population (controls, publisher=world_bank_wdi, n=14447)world_bank_wdi:SP.URB.TOTL.IN.ZS→ urbanisation (controls, publisher=world_bank_wdi, n=16965)
Generated by scripts/run_panel_fe.py at 2026-06-29T17:53:23+00:00
Strongest opposing argument
Every hypothesis ships with its charitable opposing argument. The framework earns credibility by handling objections at their strongest, not weakest.
Notes
First-run readiness: all cited publishers (world_bank_wdi, wgi) are status: ready in data/fetchers/publishers.yaml. All cited series are in data/vintages/ as of the Apr-2026 baseline bootstrap pull (WDI NY.GDP.PCAP.PP.KD, SI.POV.GINI, SL.UEM.TOTL.ZS, GC.DOD.TOTL.GD.ZS, SP.POP.TOTL, SP.URB.TOTL.IN.ZS; WGI GE.EST, RL.EST). This is the first hypothesis in the library whose variables are fully data-on- disk, making it the natural first-run candidate. The spec references D.2.9 Extended Nordic Model Analysis in the condition taxonomy; that entry's institutional_features list is the source of the channels specified here. v2 will add labour market flexibility and social trust as channels when OECD EPL and WVS/V-Dem fetchers ship.