IESET.
Hypotheses·monetary·usd_issuer_solvency_no_default_post_1971

The United States has not experienced a default, missed coupon, missed principal, or IMF-program distress event on dollar-denominated federal obligations across the entire post-Bretton-Woods fiat era 1971-2024, including periods when gross federal debt exceeded 100% of GDP (2013-2024) and when net interest crossed pre-1990 thresholds (2022-2024).

The descriptive zero-event record across more than five decades and at debt levels above textbook "fiscal limit" warnings is a necessary-but-not-sufficient empirical condition for the MMT currency-issuer operational-solvency claim, and a strong refutation of the household-budget-analogue framing that animates standard fiscal-cliff rhetoric.

WEAKENEDengine/runs/usd_issuer_solvency_no_default_post_1971

WEAKENED — zero qualifying events in the coded record and gross federal debt/GDP crosses 100% in 2014; default/CDS/auction gates are not machine-fetched yet

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

policy briefNeeds review

In ordinary language

In plain terms, this asks whether gross federal debt pct income is actually linked to better or worse dollar denominated default event count from 1971 to 2024.

plain answer

zero qualifying events in the coded record and gross federal debt/GDP crosses 100% in 2014; default/CDS/auction gates are not machine-fetched yet

why it matters

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

how the test works

It compares 1 country or place units from 1971 to 2024, using a descriptive design.

what was measured
What changed
  • Gross federal debt pct income
  • Net interest pct income
What we checked
  • Dollar denominated default event count
  • Us sovereign cds 5y
  • Treasury auction bid to cover ratio
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/usd_issuer_solvency_no_default_post_1971
1007550250197119982024USA
illustrative sketch · run pending
No coefficients yet. When the model fires, this chart will show dollar_denominated_default_event_count across 1 sampled countries over 1971–2024.
The shapes above are stylised — none of the lines are real data.
Placeholder for usd_issuer_solvency_no_default_post_1971. Published chart will be generated from engine/runs/usd_issuer_solvency_no_default_post_1971/chart_data.json.

Pre-registration

pre-registered
first-spec commit 098ce96 · 2026-04-30T12:57:33Z
run generated · 2026-05-16T13:27:13Z

The United States has not experienced a default, missed coupon, missed principal, or IMF-program distress event on dollar-denominated federal obligations across the entire post-Bretton-Woods fiat era 1971-2024, including periods when gross federal debt exceeded 100% of GDP (2013-2024) and when net interest crossed pre-1990 thresholds (2022-2024). The descriptive zero-event record across more than five decades and at debt levels above textbook "fiscal limit" warnings is a necessary-but-not-sufficient empirical condition for the MMT currency-issuer operational-solvency claim, and a strong refutation of the household-budget-analogue framing that animates standard fiscal-cliff rhetoric.

Falsification criterion — what would disprove this

set before the run · honoured after

This hypothesis is considered falsified if:

The hypothesis is falsified if any of the following are recorded in the 1971-08-15 through 2024-12-31 window: (a) a missed coupon or principal payment on any dollar-denominated US Treasury obligation, (b) an IMF program or formal external bailout request by the US government, (c) a sovereign-CDS 5y peak above 100bp on dollar-denominated US debt, or (d) a Treasury auction failure requiring direct Federal Reserve primary-market purchase to clear. A single qualifying event falsifies the descriptive claim.

formal test & threshold
test:      usd_default_event_count_post_bretton_woods
threshold: zero qualifying events 1971-08-15 to 2024-12-31

Method

Template
descriptive
Clustering
episode
Sample
1 countries · 1971 – 2024
Evidence type
descriptive

Descriptive event-count tabulation across 1971-2024. Pattern test: zero qualifying default-or-distress events at any debt-to-GDP threshold reached in the sample. No inferential model required — the claim is a count claim. Robustness: cross-check against Hanke sovereign-default registry, Reinhart-Rogoff "this-time-is-different" episode list, and IMF Article IV documents.

Data

VariableSourceTransform
dollar_denominated_default_event_count
outcome
constructed:zero events documented for federal dollar-denominated obligations 1971-08-15 to 2024-12-31; manually coded from Moody's-tier 5
count
us_sovereign_cds_5y
outcome
academic:bloomberg_cdstier 4
level_bp
treasury_auction_bid_to_cover_ratio
outcome
fred:auction_resultstier 1
ratio
gross_federal_debt_pct_gdp
treatment
fred:GFDEGDQ188Stier 1
level_pct
net_interest_pct_gdp
treatment
fred:A091RC1Q027SBEAtier 1
fred:GDPtier 1
ratio
post_bretton_woods_indicator
treatment
constructed:binary = 1 from 1971-08-15 (Nixon shock; gold-window closure)tier 5
binary
cpi_inflation
control
fred:CPIAUCSLtier 1
pct_change_yoy
dxy_dollar_index
control
fred:DTWEXBGStier 1
log_level

● ready  · ● pending  · ● reconstruct-needed

Detailed result card

Result card — usd_issuer_solvency_no_default_post_1971

Verdict: WEAKENED — zero qualifying events in the coded record and gross federal debt/GDP crosses 100% in 2014; default/CDS/auction gates are not machine-fetched yet

Pre-registration

  • Claim: The United States has not experienced a default, missed coupon, missed principal, or IMF-program distress event on dollar-denominated federal obligations across the entire post-Bretton-Woods fiat era 1971-2024, including periods when gross federal debt exceeded 100% of GDP (2013-2024) and when net interest crossed pre-1990 thresholds (2022-2024). The descriptive zero-event record across more than five decades and at debt levels above textbook "fiscal limit" warnings is a necessary-but-not-sufficient empirical condition for the MMT currency-issuer operational-solvency claim, and a strong refutation of the household-budget-analogue framing that animates standard fiscal-cliff rhetoric.
  • Falsification rule: The hypothesis is falsified if any of the following are recorded in the 1971-08-15 through 2024-12-31 window: (a) a missed coupon or principal payment on any dollar-denominated US Treasury obligation, (b) an IMF program or formal external bailout request by the US government, (c) a sovereign-CDS 5y peak above 100bp on dollar-denominated US debt, or (d) a Treasury auction failure requiring direct Federal Reserve primary-market purchase to clear. A single qualifying event falsifies the descriptive claim.
  • Falsification test: usd_default_event_count_post_bretton_woods

Comparison

  • shape: us_issuer_solvency_zero_event_gate
  • country: USA
  • period: [1971, 2024]
  • qualifying_default_or_distress_event_count: 0
  • event_count_source: spec-coded zero-event claim; machine-readable default/CDS/auction vintage not yet loaded
  • machine_fetched_event_vintage_loaded: False
  • cds_gate_loaded: False
  • treasury_auction_gate_loaded: False
  • context: {'gross_debt_pct_gdp_max': {'year': 2020, 'value': 122.302125}, 'gross_debt_pct_gdp_cross_100': {'year': 2014, 'value': 101.09735500000001}, 'us_treasury_yield_10y': {'min': 0.889203187250996, 'max': 13.92136546184739, 'end_year': 2024, 'end_value': 4.20796}, 'us_treasury_yield_30y': {'min': 1.5561354581673306, 'max': 13.44586345381526, 'end_year': 2024, 'end_value': 4.40728}, 'cpi_yoy_peak': {'year': 1980, 'value': 13.50172215843859}}

Extracted threshold: {'percent': 100.0}

Variables resolved

  • fred:GFDEGDQ188S → gross_federal_debt_pct_gdp (treatment, publisher=fred, n=60)
  • fred:A091RC1Q027SBEA; fred:GDP → net_interest_pct_gdp (treatment, publisher=fred, n=79)
  • constructed: binary = 1 from 1971-08-15 (Nixon shock; gold-window closure) → post_bretton_woods_indicator (treatment, publisher=constructed, n=54)
  • fred:CPIAUCSL → cpi_inflation (controls, publisher=fred, n=80)
  • fred:DTWEXBGS → dxy_dollar_index (controls, publisher=fred, n=21)

Variables missing data

  • constructed: zero events documented for federal dollar-denominated obligations 1971-08-15 to 2024-12-31; manually coded from Moody's-S&P-Fitch sovereign-default tables (outcome, name=dollar_denominated_default_event_count)
  • academic:bloomberg_cds (outcome, name=us_sovereign_cds_5y)
  • fred:auction_results; manual: TreasuryDirect auction tables (outcome, name=treasury_auction_bid_to_cover_ratio)

Generated by scripts/run_descriptive.py at 2026-05-16T13:27:13+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

MMT-framed sister to the existing us_dollar_issuer_solvency_record draft. Where the existing draft treats the zero-default record as trivially descriptive, this candidate spec frames it as the pre-registered empirical surface of a falsifiable MMT prediction: that a sovereign currency-issuer faces no operational solvency constraint on debt denominated in its own currency, distinct from any inflation or political-economy constraint. Counters Reinhart-Rogoff 90%-cliff rhetoric and standard "unsustainable trajectory" framings applied to advanced sovereign issuers.

Authored framework. Read the transparency note.