Where we sit on a 145-year stress chart

History

Today's reading set against historical episodes. The live series begins when the first swarm snapshot is uploaded; reference lines mark reconstructed scores at past peaks.

Episodes

Oct 1973 — Mar 1974 CCI 78 reconstructed

OPEC oil embargo

Triggers active
  • Oil supply shock (analog: Iran/Hormuz)
  • Treasury basis stress (analog)
Amplifiers hot
  • Valuation (Nifty Fifty peak)
  • Concentration

The October 1973 Arab embargo cut Western crude supply by roughly 5 mb/d, quadrupling oil prices over twelve months. The S&P 500 entered the shock already richly valued at the tail of the Nifty Fifty era; the configuration paid for it with a near-halving over twenty-one months. Two of the modern framework's triggers have direct analogs (oil supply, basis-trade stress as bond markets repriced) and two amplifiers (valuation, concentration) were elevated. No formal CCI series exists for the period; the 78 figure is a reconstruction.

S&P 500 −48% peak-to-trough Jan 1973 → Oct 1974 Paper §9
Oct 1987 CCI 71 reconstructed

Black Monday — portfolio insurance unwind

Triggers active
  • Basis-trade / portfolio insurance feedback
Amplifiers hot
  • Valuation
  • Concentration (program trading)

Black Monday is the framework's archetypal mechanical-feedback episode. Portfolio insurance strategies created a forced-seller dynamic that the market microstructure could not absorb in a single trading day. Valuation entering the event was elevated but not extreme. Concentration in the form of program-trading flow was the binding amplifier. The 1987 reconstruction sits below 1999/2008/2020 because the slow-moving state variables were less stretched; the single-day move was driven by transmission mechanics, not configuration.

S&P 500 −22.6% on Oct 19, 1987 (single day); −33% peak-to-trough Paper §9
Dec 1999 CCI 64 reconstructed

Dot-com peak — CAPE 44.19, the all-time high

Triggers active
  • AI capex analog (telecom/internet capex)
Amplifiers hot
  • Valuation (CAPE 44.19, all-time high)
  • Concentration (top-5 weight 18%)
  • Capex debt-financing

December 1999 is the framework's primary historical anchor for the current configuration. The Shiller CAPE printed 44.19 — still the all-time high in 145 years of monthly data. Concentration was elevated (the top-five names held an unprecedented share of the index) and capex was shifting from operating cash flow toward debt financing across the telecom/internet build-out. The score reconstructs to 64; today's reading of 64 matches it almost exactly. The 21 monthly entry points within the CAPE ≥40 regime that have ever existed delivered ≥25% drawdowns in 13 cases — a 61.9% rolling-window coverage rate with n=1 at the episode level.

S&P 500 −49.1% peak-to-trough Mar 2000 → Oct 2002 Paper §7.3
Sep 2008 CCI 87 reconstructed

Global financial crisis — Lehman week

Triggers active
  • Private credit dislocation (structured credit)
  • Treasury basis-trade dysfunction
  • AI capex analog (housing-credit capex collapse)
Amplifiers hot
  • CRE debt wall (commercial real estate)
  • Concentration (financial-sector weight)
  • IG supply stress

The GFC reconstruction is the framework's most-elevated historical anchor below 2020. Multiple Tier 1 and Tier 2 triggers fired in close succession: structured-credit blowups, basis-trade dysfunction in Treasury markets, and forced selling across CRE and bank balance sheets. The score reconstructs to 87 — well into the SEVERE band, approaching EXTREME. The episode is the framework's strongest precedent for amplifier compounding: individually addressable stresses became systemic through balance-sheet linkages.

S&P 500 −56.8% peak-to-trough Oct 2007 → Mar 2009 Paper §9
Mar 2020 CCI 91 reconstructed

COVID shock — liquidity dash-for-cash

Triggers active
  • Exogenous demand shock (no direct framework analog)
  • Treasury basis-trade dislocation
Amplifiers hot
  • Valuation (CAPE 30)
  • Concentration (Mag-5 share)
  • IG supply (record issuance Q2)

March 2020 is the framework's highest historical anchor — but with the largest caveat. The triggering event was exogenous (a pandemic), not one of the modeled framework triggers. What the framework *did* capture was the speed at which a shock propagated through a market already carrying elevated valuation, sector concentration, and basis-trade fragility. The score reconstructs to 91, reflecting the configuration's elevated state more than the trigger's framework fit. The recovery was the fastest in S&P 500 history — a reminder that drawdown coverage is not duration.