The distinction that unlocks gold

A bond yield tells you how many nominal dollars you earn. It does not tell you what those dollars are worth. Subtract inflation and you get the real yield — what you earn in purchasing power. That is the number that drives assets with no cash flow.

real yield  ~=  nominal yield - expected inflation

Why gold cares

Gold pays nothing. Holding it costs you the return you could have earned elsewhere — the opportunity cost is the real yield. When real yields fall, that cost falls, and gold becomes more attractive. This is why gold can rally during periods of high inflation: if nominal yields rise less than inflation, real yields fall.

Two ways to get real yields

Approximate — take a nominal yield and subtract a realised or survey inflation measure. Fast, transparent, and wrong at the margin because it uses backwards-looking inflation.
Market-implied — the difference between a nominal government bond and an inflation-linked bond of the same maturity (the break-even). This is what the market actually expects, and it is the cleaner number.

Other places the distinction matters

Growth — nominal GDP growth can look strong while real growth is flat.
Earnings — revenue growth during high inflation is partly price, not volume.
Debt — high nominal rates are far more painful when inflation is low, because the real burden is higher.

The honest caveat

The simple subtraction is an approximation. Inflation-linked markets embed risk premia and liquidity effects, so break-evens are not pure expectations. Use the approximation for intuition and the market-implied measure when precision matters.

How to check this yourself

Take the current policy rate and the latest inflation reading and subtract. That is the real rate, and it is the number that actually matters. Do it once with headline inflation and once with core, and note how different the answers are. Then find a period when nominal rates rose but real rates fell — and see what risk assets did.