Before the ETF era, gold was often held for crisis hedging and jewelry demand, making its price harder to separate from those influences. As financial ownership expanded, the opportunity cost of holding gold became a more important pricing force. Central banks have remained a separate source of demand, but in PIMCO's framework the dominant variable is still the real yield on U.S. government debt.
The metal produces no income stream. For investors, that makes the level of real yields - what U.S. Treasuries pay after inflation - central to how PIMCO thinks about the metal. PIMCO describes a hypothetical asset with no default risk and a real value that varies around a constant level, maintaining its purchasing power in the long run.
How much investors would pay for that asset would vary with real yields. When real yields are high, the estimated long-run real value is discounted more heavily; when they are low, the opportunity cost shrinks. PIMCO applies that logic to gold and argues investors appear to price the metal in the same way.
Gold prices have tracked 10-year U.S. real yields closely since 2004. Gold prices increased from about $700 an ounce, in today's dollars, to more than $3,200 an ounce from 2004 through 2025. The 2004 introduction of U.S. gold exchange-traded funds helped make gold a liquid financial asset.
PIMCO says the marginal price of gold is now largely set by financial demand, as investors compare the expected real return on gold with that of other liquid financial assets. U.S. ETFs alone now hold more than $150 billion in gold.
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Since then, gold has become a macro asset as much as a metal. Investment flows can move the spot price quickly, and central banks can add a separate layer of demand. PIMCO's work focuses on the yield side of that equation: with gold offering no income, the real return investors give up by holding it is the core comparison.
PIMCO regressed the natural log of gold's inflation-adjusted price between 2004 and 2025 on the 10-year real yield derived from U.S. Treasury Inflation-Protected Securities. The result: with other factors held constant, a one-percentage-point climb in 10-year real yields has historically corresponded to an 18% drop in gold's inflation-adjusted price. That translates to an empirical real duration of about 18 years.
PIMCO notes that because gold pays no income, the empirical 18-year duration is not a fixed constant. The 18-year figure is empirical, and PIMCO says it may change.
PIMCO also constructs a real yield-adjusted gold price, applying a discount factor tied to an 18-year real duration and current real yields. If real yields explained all moves in gold, that adjusted price would be completely static. That adjusted price has usually been less volatile than the inflation-adjusted price, except in recent years, when central-bank gold purchases changed the dynamic.
The relationship has shown up in specific episodes. In April 2013, gold prices dropped 15% after talk of U.S. Federal Reserve tapering. The price drop came two weeks before the fixed-income market's sharp upward move in yields.
In May 2013, 10-year real yields climbed 57 basis points. PIMCO said those moves matched the 18-year real duration found in the historical data, and the gold signal foreshadowed where rates were heading and how far.
Gold prices have not always followed real yields. The new U.S. gold ETF generated a surge in investor demand during 2005, and PIMCO says that surge shifted the valuation relationship between gold and real yields. Gold's safe-haven reputation also matters. In the credit crisis and after Lehman Brothers failed, many expected gold to shine, but it fell in the second half of 2008.
PIMCO, though, says real yield changes account for most of gold's price swings. Major structural shifts can hit valuation too, but over roughly the past 20 years, real yields have been the dominant force.
PIMCO expects gold to behave more like it did in the past 20 years than in the 1970s. In a portfolio, gold can help mitigate idiosyncratic risks. But because real yields have driven gold prices, investors should expect gold to continue moving with changes in real yields.
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