Policies·us_black_monday_1987_response

Black Monday 1987 and Greenspan liquidity response

USA·1987 – ·enacted 1987-10-19candidate

movesmonetary expansion direction↑financial deregulation↓

What the policy did

19 October 1987 Dow Jones fell 22.6% in a single session, largest one-day percentage decline on record. Greenspan (two months into chairmanship) issued one-sentence statement 20 October pledging liquidity; Fed open-market desk flooded banks with reserves and pressured bank lending to brokers. Established the "Greenspan put" precedent of Fed rescue of financial markets. Brady Commission report (January 1988) catalogued portfolio-insurance and program-trading propagation; SEC circuit-breakers introduced 1988.

Policy-content fingerprint — what this policy moved, on which axes

Per invariant 3, reforms are scored by what they did on each channel-separated axis, not by the party that enacted them. This fingerprint is how the policy-match engine finds historical analogues.

intended

↑

monetary expansion direction

monetary.monetary_expansion_direction

Direction of monetary-base expansion decisions relative to trend. Separate from fiscal.transfer_expansion even when correlated.

increased · weak

expansionary (balance sheet, rates lower than Taylor)

Short-run liquidity injection; rates rose back in 1988.

↓

financial deregulation

regulatory.financial_deregulation

Financial-sector regulation — banking separation, capital requirements, cross-border activity rules, derivatives oversight.

decreased · weak

looser financial regulation

SEC circuit-breakers.

Enacted by

us_reagan_second_term_1985_1989

Empirical evidence — linked hypotheses

Explicit links are curated by the author. Inferred links are hypotheses in the library that test the same axes this policy moved — the framework's answer to "what does the data say about a policy like this?".

Across the 2008-2014 ZLB era and the 2020-2021 pandemic-response window, large-scale de-facto monetary finance of fiscal expansion in the US, Japan, and the Eurozone did not produce headline-CPI inflation consistent with naive quantity-theoretic monetisation predictions: cumulative central-bank balance-sheet expansion exceeded 15% of GDP while CPI YoY remained below 3% in each economy across both windows.

monetary_finance_zlb_no_inflationinferred

viamonetary.monetary_expansion_direction

REFUTED — CPI threshold breach: USA zlb_2008_2014 peak 3.81% in 2008; USA covid_2020_2021 peak 4.68% in 2021; Eurozone CPI not loaded

refuted

Every documented modern hyperinflation episode (Cagan ≥50% monthly inflation, Hanke-Krus catalogue) since 1900 falls into one of two categories: (a) the issuing state had material foreign-currency or gold-clause obligations, hard-currency-pegged debt, or external market dependency that left it operating effectively as a currency-user (Weimar reparations, Hungary 1945-46 occupation obligations, Yugoslavia FX debt, Zimbabwe USD obligations 2007+, Venezuela USD oil revenue dependency, Argentina USD debt, Lebanon USD-pegged banking system, Turkey 2021-2024 FX-denominated debt), or (b) the issuing state experienced a documented physical supply collapse independent of the monetary regime (Weimar Ruhr occupation, Hungary post-WW2 occupation/reparation, Zimbabwe land-reform output collapse, Venezuela oil-sector collapse).

currency_user_vs_issuer_hyperinflation_classificationinferred

viamonetary.monetary_expansion_directionregulatory.financial_deregulation

INCONCLUSIVE_DATA_PENDING

run pending

Post-2008 large-scale asset purchase programmes by the Federal Reserve, ECB, Bank of England, and Bank of Japan produced a measurable divergence between asset-price inflation (equities and residential real estate) and headline consumer-price inflation until roughly 2021.

qe_asset_inflation_vs_cpi_divergence_post_2008inferred

viamonetary.monetary_expansion_direction

refuted — Only 2 of 8 countries had even a 0.10 log-point asset-vs-CPI gap by 2020 (mean GAP_2020 = -0.02). The post-2008 divergence story does not survive a pa…

refuted

Statutory price ceilings set below plausible market-clearing prices produce measurable shortage indicators — stockouts, queue formation, black-market emergence, quality degradation, and in monetary- expansion contexts, large divergences between official and parallel- market prices.

price_controls_shortage_effectinferred

viamonetary.monetary_expansion_directionregulatory.financial_deregulation

SUPPORTED — all 4 canonical episodes show the shortage signature (parallel ratio > 1.5 or post/pre inflation >= 1.5x). Aggregate event-time ATT (post 0..+5, log…

supported

In a panel of advanced economies 1987-2007, base-money expansion and broad money growth correlate positively with asset-price indices (equity, real estate) but only weakly with headline CPI inflation.

austrian_monetary_expansion_asset_bubble_not_cpi_panelinferred

viamonetary.monetary_expansion_direction

INCONCLUSIVE_DATA_PENDING — insufficient observations after listwise deletion (21)

run pending

Statutory price ceilings set below market-clearing prices reliably produce shortages, rationing via queue or privilege, quality degradation, and black-market arbitrage — across every documented episode where enforcement is sustained.

price_controls_produce_shortages_and_quality_degradationinferred

viamonetary.monetary_expansion_direction

INCONCLUSIVE_DATA_PENDING — insufficient pre-period coverage (years=41, donors=1)

run pending

Following Koo (2008, 2014), the post-2008 advanced-economy recovery exhibited the diagnostic pattern of a balance-sheet recession: the private sector (households especially, plus non-financial business in the most leveraged countries) shifted simultaneously from net borrowing to net saving in pursuit of debt reduction, even when policy interest rates were at the zero lower bound.

gfc_balance_sheet_recession_post_2008_household_dual_mandateinferred

viamonetary.monetary_expansion_directionregulatory.financial_deregulation

INCONCLUSIVE_DATA_PENDING — treatment 'household_saving_rate' has no within-country variation under country fixed effects

run pending

Monetary base expansion (M2 growth) correlates with asset price inflation in equities and real estate with a lag, measurable via cointegration and lead-lag analysis across major developed economies 2008-2025.

m2_expansion_correlates_with_asset_price_inflationinferred

viamonetary.monetary_expansion_directionregulatory.financial_deregulation

partial — Housing leg met the >=6/10 + positive-mean thresholds but equities did not. Equities: 5/9 non-negative, mean lag-1 corr = +0.198. Housing: 6/10 non-ne…

partial

Similar historical policies

Ranked by axis-fingerprint overlap with this policy. Direction match bolded — those are the closest historical analogues. Shape of the match is what drives policy-outcome comparison, not the country or party label.

Inti heterodox stabilisation plan (Peru, 1985)

PER·1985

match

1.4

financial deregulationmonetary expansion direction

Plano Bresser and Plano Verão (1987-1989)

BRA·1987

match

1.3

monetary expansion directionfinancial deregulation

Malaysia ringgit capital controls and peg 1998

MYS·1998