Pre-registration
Nordic prosperity relative to peer high-income economies is better explained by the combination of generous welfare states with high trade openness, flexible labour markets, and strong competition policy than by welfare-state size alone, over the 1990-2023 period.
Falsification criterion — what would disprove this
This hypothesis is considered falsified if:
SUPPORTED if the interaction term between social spending and trade openness is positive and significant (p<=0.05), and the marginal effect of social spending on growth is significantly larger at above-median openness than at below-median openness. REFUTED if the interaction is negative and significant with p<=0.05. Otherwise PARTIAL.
formal test & threshold
test: panel_fe_interaction_welfare_openness threshold: [object Object]
Method
- Template
panel_fe- Fixed effects
country, year- Clustering
country- Sample
- 16 countries · 1990 – 2023
- Evidence type
- associational
PanelOLS with country and year FE. The specification interacts social_spending_share with trade_openness and with (1-EPL) and (1-PMR) to test whether welfare-state effects are amplified by market openness and flexibility. Decomposition reports marginal effects at high vs low openness/flexibility.
Data
| Variable | Source | Transform |
|---|---|---|
real_gdp_per_capita_growth outcome | world_bank_wdi:NY.GDP.PCAP.KDtier 2 | annual_log_growth |
labour_productivity_growth outcome | oecd_stan:gdp_per_hour_workedtier 5 | annual_growth |
social_spending_share treatment | world_bank_wdi:NE.CON.GOVT.ZStier 2 | level |
trade_openness treatment | world_bank_wdi:NE.TRD.GNFS.ZStier 2 | level |
employment_protection_legislation treatment | oecd:eprc_v1tier 2 | level |
product_market_regulation treatment | oecd_pmr:overalltier 4 | level |
log_gdp_per_capita control | world_bank_wdi:NY.GDP.PCAP.KDtier 2 | log |
tertiary_education control | world_bank_wdi:SE.TER.ENRRtier 2 | level |
institutional_quality control | wgi:GOV_WGI_GE.ESTtier 4 | level |
● ready · ● pending · ● reconstruct-needed
Detailed result card
Result card — welfare_architecture_market_openness_nordic
Verdict: PARTIAL — coef=-8.365e-20, p=0.0538; effect magnitude effectively zero
Pre-registration
- Claim: Nordic prosperity relative to peer high-income economies is better explained by the combination of generous welfare states with high trade openness, flexible labour markets, and strong competition policy than by welfare-state size alone, over the 1990-2023 period.
- Falsification rule: SUPPORTED if the interaction term between social spending and trade openness is positive and significant (p<=0.05), and the marginal effect of social spending on growth is significantly larger at above-median openness than at below-median openness. REFUTED if the interaction is negative and significant with p<=0.05. Otherwise PARTIAL.
- Falsification test: panel_fe_interaction_welfare_openness
Estimate
- Method: linearmodels.PanelOLS
- Coefficient (treatment): -8.365e-20
- Std error: 4.311e-20
- p-value: 0.0538
- Observations: 230, countries: 12
- Within R²: 1
- Fixed effects: entity=True, time=True
- Clustering: country
Variables resolved
world_bank_wdi:NY.GDP.PCAP.KD→ real_gdp_per_capita_growth (outcome, publisher=world_bank_wdi, n=12104)world_bank_wdi:NE.CON.GOVT.ZS→ social_spending_share (treatment, publisher=world_bank_wdi, n=9133)world_bank_wdi:NE.TRD.GNFS.ZS→ trade_openness (treatment, publisher=world_bank_wdi, n=10714)oecd_pmr:overall→ product_market_regulation (treatment, publisher=oecd_pmr, n=105)world_bank_wdi:NY.GDP.PCAP.KD→ log_gdp_per_capita (controls, publisher=world_bank_wdi, n=12104)world_bank_wdi:SE.TER.ENRR→ tertiary_education (controls, publisher=world_bank_wdi, n=7217)wgi:GOV_WGI_GE.EST→ institutional_quality (controls, publisher=wgi, n=5168)
Variables missing data
oecd_stan:gdp_per_hour_worked(outcome, name=labour_productivity_growth) — vintage not on diskoecd:eprc_v1(treatment, name=employment_protection_legislation) — vintage not on disk
Generated by scripts/run_panel_fe.py at 2026-06-29T17:52:02+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.