Historical Case Studies
Theory without calibration is dangerous. These cases provide the numbers that ground abstract frameworks in actual historical experience — and the primary finding is how consistent the patterns are across very different contexts. a-00185
Core Base Rates (48-Case Deflationary Base)
From the 48-case deflationary deleveraging base: a-00185
- Equity drawdown: avg 119 months (10 years), range 60–249 months
- GDP drawdown: avg 72 months (6 years), range 25–106 months
- Debt/GDP reduction: avg -54%, range -29% to -70%
These are calibration priors for any deflationary deleveraging scenario. Departing from them requires a specific mechanism.
Key Case Comparison
| Case | Duration | GDP Decline | Stock Decline | Policy Response |
|---|---|---|---|---|
| US 1929-33 | 4 years | -26% | -84% | Delayed/wrong |
| US 2007-09 | 2 years | -4% | -50% | Fast/massive |
| Japan 1990-2013 | 24 years | Flat | -80% peak | Delayed/weak |
| Greece 2008-17 | 9 years | -25%+ | Large | Constrained (Euro) |
| Weimar 1921-23 | 2 years | — | Nominal gains | No fiscal consolidation |
a-00220, a-00221, a-00222, a-00223
Four Anchor Cases
- Germany 1921-1924: Hyperinflation archetype. Fiscal monetization spiraling until currency substitution became complete, ended by a credible hard anchor at a new nominal level. a-00219, a-00220
- US 1929-1937: Ugly deleveraging made beautiful. Hoover austerity + gold standard made it worse; FDR’s break with gold and massive stimulus reversed it in 8 years from peak. a-00221
- US 2007-2009: Fast-response case. Aggressive Fed + TARP compressed what could have been a 1929-scale event into 2 years of acute crisis — at the cost of an enormous debt buildup. a-00222
- Japan 1990-2013: The anti-template. Delayed and insufficient policy extended the deleveraging to 24 years. a-00223
Inference
The US 2008 vs. Japan comparison is the most instructive for policy timing. Speed of policy response is the primary variable explaining cross-case duration differences — not the depth of the underlying imbalance. The Fed acted within months; Japan waited years.
Hyperinflation Warning
The Weimar case carries a specific warning for current conditions: hyperinflation is not primarily a monetary phenomenon — it is a fiscal phenomenon. The Reichsbank monetized because the fiscal deficit was structurally unresolvable through taxation or borrowing. The same dynamic applies whenever a government’s borrowing need exceeds what markets will absorb at stable yields. a-00219