IESET.
Hypotheses·trade·singapore_lky_changi_air_hub_tourism_1981_2019

Singapore's Changi airport, SIA, port-state, and open-city strategy produced a durable air-services and visitor hub: by the pre-COVID endpoint, tourist arrivals were multiple times resident population, receipts were material, and the same economy remained extremely trade-open.

SUPPORTEDengine/runs/singapore_lky_changi_air_hub_tourism_1981_2019

SUPPORTED - 4 of 4 metrics met threshold (support threshold 3)

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

policy briefNeeds review

In ordinary language

When countries open more of the economy to trade and competition, do people end up with better long-run income or productivity outcomes?

plain answer

The data clearly moved in the predicted direction. 4 of 4 metrics met threshold (support threshold 3)

why it matters

This matters because trade claims should change belief only when they survive a pre-declared empirical test.

how the test works

It compares 7 country or place units from 1981 to 2019, using a multi metric checklist design.

what was measured
What we checked
  • Tourist arrivals
  • Tourism receipts share exports
  • Trade openness
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

4 input datasets, 0 unresolved missing series, provenance status: partial provenance.

Results

engine/runs/singapore_lky_changi_air_hub_tourism_1981_2019
1007550250198120002019SGPHKGKORMYSTHAIDNPHL
illustrative sketch · run pending
No coefficients yet. When the model fires, this chart will show tourist_arrivals across 7 sampled countries over 1981–2019.
The shapes above are stylised — none of the lines are real data.
Placeholder for singapore_lky_changi_air_hub_tourism_1981_2019. Published chart will be generated from engine/runs/singapore_lky_changi_air_hub_tourism_1981_2019/chart_data.json.

Pre-registration

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

Singapore's Changi airport, SIA, port-state, and open-city strategy produced a durable air-services and visitor hub: by the pre-COVID endpoint, tourist arrivals were multiple times resident population, receipts were material, and the same economy remained extremely trade-open.

Falsification criterion — what would disprove this

set before the run · honoured after

This hypothesis is considered falsified if:

SUPPORTED if at least 3 of 4 pre-registered metrics meet their thresholds. REFUTED if at most 1 metrics meet after available data are evaluated. Otherwise PARTIAL or INCONCLUSIVE_DATA_PENDING.

formal test & threshold
test:      singapore_lky_changi_air_hub_tourism_1981_2019_local_multimetric_checklist
threshold: MET >= 3 of 4; REFUTE when MET <= 1

Method

Template
multi_metric_checklist
Clustering
none
Sample
7 countries · 1981 – 2019
Evidence type
canonical_case_multi_metric

Custom Singapore/UAE case checklist using local WDI, WGI, and Fraser EFW vintages.

Data

VariableSourceTransform
tourist_arrivals
outcome
world_bank_wdi:ST.INT.ARVLtier 2
endpoint_level
tourism_receipts_share_exports
outcome
world_bank_wdi:ST.INT.RCPT.XP.ZStier 2
annual_mean
trade_openness
outcome
world_bank_wdi:NE.TRD.GNFS.ZStier 2
endpoint_level

● ready  · ● pending  · ● reconstruct-needed

Detailed result card

Result card - singapore_lky_changi_air_hub_tourism_1981_2019

Verdict: SUPPORTED - 4 of 4 metrics met threshold (support threshold 3)

Pre-registration

  • Claim: Singapore's Changi airport, SIA, port-state, and open-city strategy produced a durable air-services and visitor hub: by the pre-COVID endpoint, tourist arrivals were multiple times resident population, receipts were material, and the same economy remained extremely trade-open.
  • Falsification rule: SUPPORTED if at least 3 of 4 metrics meet their thresholds; REFUTED if at most 1 meet after available data are evaluated.
  • Falsification test: singapore_lky_changi_air_hub_tourism_1981_2019_local_multimetric_checklist

Metric Results

| metric | observed | threshold | status | note | |---|---:|---|---|---| | visitor_arrivals_2019 | 19116000.000 | >= 15 million | MET | SGP tourist arrivals 2019 = 19116000.000; threshold >= 1.5e+07 | | visitor_arrivals_per_capita_2019 | 3.352 | >= 3.0 arrivals per resident | MET | SGP visitor arrivals per resident 2019 = 3.352; threshold >= 3 | | tourism_receipts_export_share | 3.011 | >= 2% of exports mean | MET | SGP tourism receipts / exports mean = 3.011; threshold >= 2 | | trade_openness_2019 | 324.395 | >= 300% of GDP | MET | SGP trade/GDP 2019 = 324.395; threshold >= 300 |

Interpretation

This is a pre-registered descriptive checklist over local vintages. It grades whether the observed case pattern clears the stated thresholds; it does not identify a single causal lever inside the policy bundle.

Sources

  • world_bank_wdi:ST.INT.ARVL -> data/vintages/world_bank_wdi/ST.INT.ARVL@2026-04-30T130312Z.parquet
  • world_bank_wdi:SP.POP.TOTL -> data/vintages/world_bank_wdi/SP.POP.TOTL@2026-04-30T135559Z.parquet
  • world_bank_wdi:ST.INT.RCPT.XP.ZS -> data/vintages/world_bank_wdi/ST.INT.RCPT.XP.ZS@2026-04-30T130334Z.parquet
  • world_bank_wdi:NE.TRD.GNFS.ZS -> data/vintages/world_bank_wdi/NE.TRD.GNFS.ZS@2026-04-30T135618Z.parquet

Steelman

See hypotheses/steelman/singapore_lky_changi_air_hub_tourism_1981_2019.md.

Strongest opposing argument

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

Notes

Uses pre-COVID 2019 endpoint to avoid pandemic collapse contaminating the hub test.

Authored framework. Read the transparency note.