Long-Horizon Return Series: GFD, CRSP, Shiller, Bridgewater
Global Financial Data (GFD) provides some of the most extensive datasets available, including fixed-income, equity, inflation, and macroeconomic data that date back centuries, with U.S. GDP figures available since the late 1700s.
The Center for Research in Security Prices (CRSP) is typically used for detailed U.S. equity returns from the 1920s onward; however, it is somewhat limited compared to GFD when it comes to global multi-asset analysis.
Shiller data, including the S&P Composite Index, extends back to the late 1800s and features cyclically adjusted P/E ratios and real returns. This data is widely utilized in models evaluating long-term equity returns.
Bridgewater Associates publishes long-horizon asset class performance and diversifier return series. These series are constructed from aggregated historical data, although the methods of derivation may vary. Most models ultimately depend on databases such as CRSP, GFD, and other reconstructed series.
These data sources contribute to multi-asset models that estimate historical returns, risk premia, correlations, and cross-asset dynamics.
Inflation-Beta Matrix (Equities, Treasuries, Key Commodity Sub-Indexes)
Based on multi-decade regression frameworks (e.g., PIMCO, Bekaert–Wang):
- Equities generally exhibit a modest positive inflation beta of approximately 0.2 to 0.5, indicating that they partially keep pace with inflation over long horizons.
- Nominal Treasuries, particularly during the 1970s and 1980s, showed positive inflation betas, reflecting losses during inflation shocks. In contrast, later periods—especially those with high real yields or inflation-indexed bonds—demonstrate varying and sometimes negative betas.
- Commodity futures indices generally have very high betas related to inflation (e.g., betas exceeding 10 in some country series), showcasing strong inflation-hedging characteristics
A historical inflation‑beta matrix might look like:
| Asset Class | 1970–1980 β to inflation | 2000–2025 β to inflation |
| Equities | ~0.3–0.5 | ~0.2–0.4 |
| Nominal Treasuries | +β (positive) | 0 to negative β |
| Inflation-indexed bonds | N/A | Negative β |
| Commodities | ~10+ | ~5–10 |
Three Data-Driven Structural Differences Between 2021–2025 and the 1970s
Reiterating and quantifying more precisely:
Labor Bargaining Power
- 1970s: Aggregate U.S. union membership exceeded 25% of the workforce, with strong centralized bargaining contributing to wage-price spirals.
- 2021–2025: Union membership fell below 11%, resulting in highly fragmented wage-setting and a weaker pass-through effect from inflation to wages
Energy Intensity of GDP
- 1970s: U.S. energy consumption per unit of GDP was approximately double that of the levels observed in the 2020s. As a result, energy shocks had a significantly larger impact on core inflation.
- 2021–2025: Energy intensity was about 40-50% lower, which reduced the direct transmission of energy price spikes.
Policy-Reaction Credibility and Inflation Expectations
- 1970s: Inflation expectations were unanchored, inflation volatility was high, and policy lag created persistent second-round effects.
- 2021–2025: Central banks have improved credibility due to stronger forward guidance, transparency regarding inflation targets, and anchored expectations, which help to mitigate price-wage spirals.
Debt-Service Burden: Today vs. 1979 and 2006 (Real Rates)
- 1979: Federal debt-to-GDP was approximately 34–35%, with real rates around 2–3% (during Volcker’s tightening). Debt service was moderate but rising.
- 2006: Debt-to-GDP was around 60%, with lower real rates (~1–2%), making debt service more affordable.
- 2025: Debt-to-GDP is expected to reach approximately 123%, with real short/long yields in the range of 1–2% and elevated term premia. Although rates are not significantly higher than in 2006, the considerably larger debt base means total interest spending will be around 3–4% of GDP, making debt service much more burdensome in real-rate terms.
Real Rate Threshold Where Debt Sustainability ‘Bites
Empirical research indicates that fiscal stress arises when real interest rates remain above the nominal GDP growth rate plus term premia at elevated debt levels (around 90–100% of GDP). Specifically:
- If real rates consistently exceed approximately 1–2% while debt-to-GDP is above 120%, debt servicing outpaces economic growth.
- Markets begin to price in rollover risk, widening credit spreads, and yield curve steepening.
- A real rate above approximately 2–3% in a high-debt environment generally signals a severe sustainability issue.
Timing Commodity Exposure: Forward Curve, CTA Trend, Macro Surprises
- Curve Structure: Monitoring contango vs. backwardation is crucial. Backwardated markets (flat/inverted curves) enhance roll yield, indicating when long exposure in trend-following Commodity Trading Advisors (CTAs) is advantageous.
- CTA Trend Indicators: Price momentum in commodity futures is central. Trend-followers adjust their positions based on consistent directional movements.
- Macro Surprise Data: Key economic surprises (CPI, wages, PMI, capital expenditure) influence short-term commodity movements—sharp positive surprises often precede cyclical upswings, while negative surprises may signal downturns.
The best timing involves blending these signals: entering long commodity positions when curves invert, momentum accelerates, and inflation or growth surprises turn positive, and vice versa for exits.
Macro Indicators as Early Inflation Cycle Rollover Signals and Current Behavior
- Hard Data Surprise Indexes: Negative cumulative hard-surprise readings historically precede inflation peaks and rollovers.
- Wage/Income Flush vs. Survey Expectations: A decline in wage surprises, or when realized data underperforms consensus expectations, often indicates an inflection point.
- Credit Spreads/M2 Growth Slowing: A slowdown in broad money or tightening credit conditions are also key indicators.
Currently (mid‑2025):
- Hard surprise indexes have turned modestly negative for several months.
- Wage and goods price surprises are fading or disappointing relative to consensus.
- Credit spreads are modestly tight; M2 growth is flat or declining.
These signs together suggest a late‑cycle peak and potential inflation rollover underway.