tools-only Historical Regime Examples
Reference cases for the 5 regime classifications. Use these to contextualize current readings and identify historical parallels.
Concentration Regimes
2023-2024: Magnificent Seven Dominance
- RSP/SPY: Declined from ~0.32 to ~0.29, a multi-year low
- IWM/SPY: Persistent underperformance of small-caps
- Credit: Stable to easing (HYG/LQD steady)
- Characteristics: Top 7 stocks drove ~60% of S&P 500 returns
- Duration: ~18 months
- Resolution: Early signs of broadening in late 2024 (RSP/SPY bottoming)
- Portfolio posture: Mega-cap growth overweight was the only winning strategy
2019-2020 (Pre-COVID): FAANG+ Concentration
- RSP/SPY: Gradual decline through 2019
- IWM/SPY: Small-cap underperformance
- Ended: Abruptly with COVID crash (exogenous shock)
Broadening Regimes
2003-2004: Post-Dot-Com Recovery
- RSP/SPY: Rose significantly as value and small-caps recovered
- IWM/SPY: Strong small-cap outperformance
- Credit: HYG/LQD rising as credit conditions eased
- Yield curve: Steep (accommodative Fed)
- Duration: ~24 months
- Portfolio posture: Small-cap value, equal-weight strategies outperformed
2016-2017: Post-Election Broadening
- RSP/SPY: Rose as cyclicals and financials rallied
- IWM/SPY: Small-cap surge post-election
- Credit: Stable to improving
- XLY/XLP: Strong cyclical outperformance
- Duration: ~12 months
- Portfolio posture: Cyclicals, financials, small-cap growth
Contraction Regimes
2007-2009: Global Financial Crisis
- Credit: HYG/LQD collapsed (credit freeze)
- XLY/XLP: Extreme defensive rotation
- SPY/TLT: Sharp decline as bonds rallied
- Yield curve: Initially inverted, then steepened dramatically
- Duration: ~18 months (bear phase)
- Portfolio posture: Cash, Treasuries, defensive sectors
2020 Q1: COVID Crash
- Credit: HYG/LQD dropped sharply in March
- XLY/XLP: Rapid defensive rotation
- SPY/TLT: Crashed as equities sold off
- Duration: ~6 weeks (shortest contraction on record)
- Resolution: Massive fiscal/monetary response triggered V-shaped recovery
- Lesson: Not all contractions are prolonged; policy response matters
Inflationary Regimes
2022: Inflation Shock
- Stock-bond correlation: Turned positive (both fell together)
- SPY/TLT: Both declined simultaneously
- 10Y-2Y: Deep inversion (most inverted since 1980s)
- Yield curve: Aggressive flattening then inversion
- Duration: ~12 months
- Portfolio posture: Energy, commodities, real assets, short-duration bonds
- Key characteristic: Traditional 60/40 portfolio failed as bonds didn't hedge
1970s Stagflation (Historical Reference)
- Stock-bond correlation: Persistently positive
- Commodities: Outperformed financial assets
- Duration: Extended (years)
- Modern parallel: 2022 showed echoes but resolved faster
Transitional Regimes
2024 Q4 - 2025 Q1: Current Example
- RSP/SPY: Near historical lows (~0.297) but showing early bottoming signs
- IWM/SPY: Mixed signals, brief outperformance then reversal
- Credit: Stable (HYG/LQD holding)
- Yield curve: Normalizing from inversion
- XLY/XLP: Choppy, no clear direction
- Interpretation: Multiple indicators shifting but no clear new regime yet
- Portfolio posture: Maintain diversification, gradual position adjustments
2018: Failed Broadening
- RSP/SPY: Brief broadening attempt in early 2018
- Credit: Tightened in Q4 2018 (HYG selloff)
- Resolution: Fed pivot in early 2019 prevented full contraction
- Lesson: Transitional periods can resolve in any direction
Regime Transition Patterns
Common Sequences
Concentration → Broadening: Usually requires catalyst (Fed easing, fiscal stimulus, valuation compression in leaders)
Broadening → Contraction: Credit tightening is the typical trigger. Watch HYG/LQD for early warning.
Contraction → Broadening: Policy response (rate cuts, QE) → credit easing → small-cap recovery
Any → Inflationary: Positive stock-bond correlation is the key signal. Can emerge from either broadening or contraction.
Transition Timing
- Average regime duration: 12-24 months
- Transition phase: Typically 3-6 months of ambiguous signals
- Early signals appear 2-4 months before consensus recognition
- MA crossovers (6M vs 12M) confirm after the fact but provide low false-positive rate
False Signals
- 2018 Q1: Broadening signal reversed by Q4 (trade war + Fed tightening)
- 2015: Multiple signals of contraction that never fully materialized
- Lesson: Require 3+ months of sustained signals before high-conviction repositioning