Term-structure theory arguing that different maturity zones are priced by separate investor demand rather than one unified expectations curve.
Market segmentation theory says different parts of the yield curve can be priced by separate supply-and-demand forces rather than by one unified expectations curve. In this view, short, intermediate, and long maturities can behave differently because different investors prefer different maturity zones.
A yield curve can move because investors change views about future short rates, but it can also move because supply or demand changes in one maturity segment. Market segmentation theory helps analysts avoid over-reading every curve move as a pure macro signal.
If pension funds and insurers have strong demand for long-duration assets, long yields may stay lower than expected even when short rates are high. That long-end behavior may reflect liability-matching demand, not only a market forecast that future short rates will fall.
| Curve behavior | Segmentation question |
|---|---|
| Long yields fall while short yields stay high | Is long-end demand from pensions, insurers, or reserve managers dominating expectations? |
| The belly cheapens versus wings | Is issuance or hedging pressure concentrated in intermediate maturities? |
| Bill yields behave differently from notes and bonds | Are cash-management, collateral, or money-market forces driving the front end? |
| Corporate and Treasury curves diverge | Are credit, liquidity, and investor-base differences more important than benchmark rates? |
Use observed curve data from U.S. Treasury interest rate statistics or Federal Reserve H.15 selected interest rates. When the analysis relies on supply-demand explanations, document the maturity segment, issuer supply, investor base, and date rather than citing curve shape alone.
This page is for financial education only. It does not recommend a curve trade, duration position, bond fund, or hedging strategy.