Why a Longer Loan Usually Costs More
A yield curve compares interest rates on bonds with different maturity dates, often government bonds from the same issuer. When the curve slopes upward, longer-term bonds offer higher yields than short-term ones. That extra return compensates investors for tying up money and accepting more uncertainty about inflation and future interest rates.
The Risk of Waiting
A dollar returned next year can be reinvested sooner than a dollar locked away for ten years. Over the longer stretch, prices may rise and erode what that money can buy; meanwhile, market rates may climb, making an older bond with a lower fixed payment less attractive. Investors therefore tend to demand a higher yield to hold long-dated debt.
Bond prices and yields move in opposite directions: when a bond’s price falls, its fixed payments amount to a higher return for someone buying it at that lower price. The yield curve reflects these market prices, not a schedule of rates set directly by the government.
A Pattern, Not a Promise
The curve can also reflect expectations about future short-term rates and the supply of bonds available to investors. So a rising curve does not mean every long-term loan is riskier in the same way, nor does it guarantee that long-term rates will stay higher. It is a snapshot of the compensation investors currently require to wait—and of what markets collectively anticipate.
That is why the curve matters beyond bond trading: its shape can influence borrowing costs for mortgages, businesses, and governments, even as the rates on those loans differ from bond yields.
