Term-structure theory arguing that longer maturities usually need extra yield because investors prefer liquidity and shorter commitments.
Liquidity preference theory says that longer-term rates reflect expected future short-term rates plus extra compensation for holding less liquid, more interest-rate-sensitive maturities. It modifies pure expectation theory by adding a maturity premium.
This theory matters because it explains why yield curves are often upward sloping even when investors do not expect short-term rates to rise very much. Longer maturities usually carry more price volatility and tie up capital for longer, so investors often want additional yield before they hold them.
That makes liquidity preference theory useful when analysts want to separate rate expectations from compensation for maturity risk.
A simplified way to express the idea is:
Under this view, a long-maturity yield can sit above the average expected short-rate path even if investors do not expect aggressive policy tightening.
| Curve interpretation | Pure expectation theory | Liquidity preference theory |
|---|---|---|
| Normal upward slope | Future short rates are expected to rise | Future short rates may rise, but term premium can also create the slope |
| Mild inversion | Future short rates are expected to fall | Future short rates may need to fall even more because the curve is fighting a positive premium |
| Steep long end | Mostly expectations | Expectations plus heavier compensation for maturity risk |
Suppose the average expected short-rate path over the next 5 years is 3.80%, but investors want an extra 0.40% to hold a 5-year bond instead of rolling short paper. Liquidity preference theory would imply a 5-year yield near:
That difference is one reason long yields can stay above the path implied by expected short rates alone.
This page covers the yield-curve theory. The broader Keynesian money-demand concept is discussed separately in Liquidity Preference.
It says they usually want compensation for doing so. Liability-driven investors such as insurers or pensions may still prefer longer maturities, but the market often prices in some premium for maturity exposure.