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Recent Interactions of Asset Classes with Inflation (CPI)

Steve LeCompte | | Posted in: Bonds, Commodity Futures, Economic Indicators, Equity Premium, Gold, Real Estate

Guide Market Indicators Economic indicators

Key Insight

Quarterly change in NSA all-items CPI correlates negatively with ETF returns two to three quarters later for multiple asset classes, with long-term Treasuries and gold differing (10 ETFs; Dec 2007–mid-Aug 2026; lead-lag; descriptive; not a trading test).

How do returns of different asset classes recently interact with inflation as measured by monthly change in the not seasonally adjusted, all-items consumer price index (CPI) from the U.S. Bureau of Labor Statistics? To investigate, we look at lead-lag relationships between change in CPI and returns for each of the following 10 exchange-traded fund (ETF) asset class proxies:

  • Equities:
    • SPDR S&P 500 (SPY)
    • iShares Russell 2000 Index (IWM)
    • iShares MSCI EAFE Index (EFA)
    • iShares MSCI Emerging Markets Index (EEM)
  • Bonds:
    • iShares Barclays 20+ Year Treasury Bond (TLT)
    • iShares iBoxx $ Investment Grade Corporate Bond (LQD)
    • iShares JPMorgan Emerging Markets Bond Fund (EMB)
  • Real assets:
    • Vanguard REIT ETF (VNQ)
    • SPDR Gold Shares (GLD)
    • Invesco DB Commodity Index Tracking (DBC)

Using monthly total CPI values and monthly dividend-adjusted prices for the 10 specified ETFs during December 2007 (limited by EMB) through mid-August 2026, we find that:

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