On our bonds tab you will find entries like the US 10-Year Treasury quoted not in dollars but in something stranger: a yield. Financial television treats tiny moves in this number as major news, and with reason — few figures reach further into the world economy. Here is what it means, from the ground up.

A bond, in one paragraph

A bond is a loan cut into pieces investors can buy. A government or company borrows money, promises fixed interest payments along the way, and repays the full amount on a set date. Because the payments are fixed at birth, what changes afterwards is not the bond's promises but its price — bonds trade hands constantly, above or below their original value.

Yield: the return at today's price

Yield answers a buyer's only real question: if I buy this bond at today's market price and hold it, what annual return do I get? Because the interest payments are fixed, the yield depends entirely on the price paid. Pay less than the original value and your fixed payments represent a better return — a higher yield. Pay more and the yield shrinks.

This produces the seesaw rule that confuses everyone at first: when bond prices fall, yields rise, and vice versa. They are two views of the same object, like a fraction and its reciprocal.

Why yields move

Bond investors are obsessed with two things: inflation and central banks. Inflation quietly eats fixed payments — a bond paying a set amount for ten years is a poor deal if prices double meanwhile — so expectations of higher inflation push investors to demand higher yields. Central bank rates set the competition: when new bonds are issued at higher rates, older low-rate bonds must fall in price (raising their yield) to stay attractive.

Why the 10-year Treasury rules them all

The 10-year yield of the US government is treated as the world's "risk-free" benchmark: the return available for lending to the planet's largest borrower for a decade. Almost everything else is priced as a premium above it. Mortgage rates track it. Corporate borrowing costs stack on top of it. Stock valuations lean on it, because it is the alternative every share must beat. When it climbs quickly, borrowing gets dearer worldwide and richly valued stocks tend to wobble.

An inverted curve

Occasionally short-term yields rise above long-term ones — an "inverted yield curve" — meaning investors expect rate cuts ahead, usually because they anticipate economic trouble. Inversions have preceded many recessions, which is why the shape of the curve, not just its level, gets watched.

On the tracker

Watch the 10-year yield beside the S&P 500 and gold. On days the yield jumps, growth stocks often stumble and gold hesitates; on days it slides, both frequently breathe easier. One number, many echoes.