Fisher Effect

The Fisher effect, named for economist Irving Fisher, holds that nominal interest rates adjust to reflect expected inflation, so that the nominal rate approximately equals the real rate plus expected inflation. If lenders require a 2 percent real return and expect 3 percent inflation, nominal rates settle near 5 percent.

Why it matters

The Fisher equation is the lens through which markets separate money illusion from reality. A 5 percent yield means nothing until inflation is subtracted; savers in 2022 earning 4 percent while inflation ran above 8 percent were losing purchasing power despite historically decent nominal rates. The framework underlies inflation indexed bonds, whose spread over ordinary Treasuries reveals the market's inflation expectations, and it explains why central banks watch expectations so anxiously: once higher inflation is expected, it embeds itself in every rate and wage negotiation. Fisher himself is a cautionary figure, brilliant on money and famously wrong in October 1929, days before the crash, about stocks reaching a permanently high plateau.

In the gold vs bitcoin debate

Real rates, the Fisher equation's residual, are the single best documented driver of gold. When real yields are deeply negative, as in the 1970s and 2020 to 2022, holding a yieldless metal costs nothing and gold tends to thrive; when real yields rise, gold struggles. Bitcoin has increasingly traded with the same sensitivity as institutional ownership grew. Both assets are, in Fisher's terms, bets that realized inflation will exceed what nominal rates currently promise to pay for.