Ehren Stanhope, O’Shaughnessy Asset Management – The Great Inflation, Factors, and Stock Returns (The Best Investment Writing Volume 6)

Episode Summary

Executive Summary: The episode revisits Erin Stanhope’s paper on inflation and stock returns, arguing that the 1970s Great Inflation was driven by a unique mix of policy, labor, energy, and monetary conditions that differ materially from today. While high inflation generally hurts equity returns through valuation compression, certain factors—especially value, momentum, and shareholder yield—have historically been more resilient, making them useful portfolio hedges in moderate to high inflation regimes.

Main Topics: Why the Great Inflation is not a perfect template for today (Priority: 5/5): The speaker argues the 1965-1982 inflation episode was shaped by unusual conditions—Bretton Woods collapse, oil shocks, high taxes, strong unions, and accommodative policy—that are not fully present now. Monetary policy and money supply vs. velocity (Priority: 5/5): Money supply growth has been similar to the Great Inflation era, but weak money velocity post-GFC has dampened inflationary pressure and reduced the chance of a repeat spike. Fiscal, tax, and labor dynamics (Priority: 4/5): High marginal tax rates, lack of bracket indexing, deficit spending, and powerful unions reinforced wage-price spirals in the 1970s; today these pressures are much weaker. Energy vulnerability then vs. now (Priority: 4/5): The 1970s oil shocks amplified inflation, whereas the U.S. is now a net energy exporter and more insulated from commodity shocks. Equity market behavior across inflation regimes (Priority: 5/5): Using CPI-based inflation deciles since 1926, the analysis finds equities perform worst at the inflation extremes, especially in real terms when inflation is very high. Factor resilience in inflationary environments (Priority: 5/5): Value, momentum, and shareholder yield outperform more consistently than the broad market in moderate-to-high inflation regimes, with shareholder yield strongest overall. Portfolio implications for investors (Priority: 4/5): Investors should monitor wage growth, money velocity, and policy tolerance for inflation, while tilting toward factors that can defend against valuation compression.

Key Arguments: The Great Inflation was an historical aberration caused by a specific mix of easy money, regime change in global currencies, labor power, high taxes, and oil shocks. Loose monetary policy alone does not guarantee inflation; inflation also depends on money velocity, labor market tightness, fiscal policy, and supply shocks. High corporate and personal tax rates in a high-inflation world can worsen effective taxation and encourage inefficient corporate spending. Inflation tends to compress equity valuation multiples, which helps explain weaker nominal and especially real equity returns at high inflation levels. Value stocks tend to be shorter-duration assets and are less vulnerable to multiple compression than growth stocks. Momentum can work in inflationary periods because strong price trends often reflect firms that can pass through rising costs and preserve earnings growth. Shareholder yield is especially resilient because buybacks and dividends return capital quickly and are often concentrated in cheaper stocks. In the highest inflation regime, factors can help investors roughly maintain purchasing power even when the broad market delivers negative real returns.

Data Points: Average U.S. inflation since 1926: About 3% annually - Long-run historical benchmark for U.S. inflation Deflation during the Great Depression: -10.8% - Pre-WWII extreme inflation/deflation swing Post-World War II inflation peak: +20.1% - After price controls were ended Great Inflation period: 1965 to 1982 - The episode used for comparison with today Average inflation during Great Inflation: 6.5% annually - Inflation rate across the 1965-1982 era Money supply growth during Great Inflation: 8.7% average YoY - M2 growth from 1965 to 1982 Money supply growth since 2008: 7.6% average - M2 growth in the post-GFC era Union membership today: Approximately one-third of its 1960 peak - Reduced labor negotiating power relative to the 1960s U.S. net energy imports in 1973: 17% of total energy consumption - Before the first major oil shock U.S. net energy imports in 1979: 23% of total energy consumption - Near the second oil shock Corporate tax rate during Great Inflation: 48% average from 1965 to 1982 - High tax environment amplifying inflation effects Recent corporate tax rate referenced: 26.5% - Used as a comparison to the 1970s tax regime Average individual marginal tax rate increase: 57% rise between 1965 and 1980 - Tax creep intensified stagflation pressures Highest inflation regime average: 11.2% annual inflation - Top decile inflation environment in the study Money velocity post-GFC: Sluggish / has done the opposite of the Great Inflation - Mitigating factor against inflation spikes S&P 500 P/E ratio change during Great Inflation: Roughly 20x in 1965 to 10x in 1982 - Illustrates valuation compression during sustained inflation

Pivotal Quotes: "Inflation is as violent as a mugger, as frightening as an armed robber, and as deadly as a hitman." — Ronald Reagan: Opening quote framing the severity of inflation "The Great Inflation was a bit of an historical aberration." — Erin Stanhope: Summarizing why the 1970s are not a simple guide to the present "For equity investors, it might just be possible to reduce inflation to an amateur pickpocket." — Erin Stanhope: Bottom-line takeaway on how factor exposure can blunt inflation damage

Implications: Investors should not assume a 1970s replay, but should watch wages, velocity, and policy. In inflationary periods, broad equities may struggle, while value, momentum, and shareholder yield can improve resilience and real returns.