The effects of asset liquidity on expected returns for assets with infinite maturities (stocks) are examined for bonds (Treasury notes and bills with matched maturities of less than 6 months). The yield to maturity is higher on notes, which have lower liquidity. The yield differential between notes and bills is a decreasing and convex function of the time to maturity. The results provide a robust confirmation of the liquidity effect in asset pricing. THIS PAPER STUDIES EMPIRICALLY the effects of the liquidity of capital assets on their prices. Amihud and Mendelson (1986, 1989) proposed that liquidity affects asset prices because investors require a compensation for bearing transaction costs. Transaction costs-paid whenever the asset is traded-form a sequence of cash outflows. The discounted value of this cost stream proxies for the value loss due to illiquidity, which lowers the asset's value for any given cash flow that the asset generates.' As a result, the return on assets should be an increasing function of their illiquidity (other things equal). For stocks, the illiquidity effect is expected to be strong because their transaction cost sequence is infinite. Amihud and Mendelson (1986, 1989) demonstrated that common stocks with lower liquidity yielded significantly higher average returns, after controlling for risk and for other factors.These results on the importance of liquidity in the pricing of stocks raise additional questions: (i) does the liquidity effect depend on the specific controls used by Amihud andMendelson (1986, 1989)? (ii) does illiquidity have a similarly strong effect on the pricing of bonds, whose maturities are finite? and (iii) if liquidity affects bond yields, how is this effect related to the bond's time to maturity? respectively. This paper was first drafted while the second author was with The William E. Simon Graduate School of Business Administration, University of Rochester, Rochester, NY. The authors thank Kenneth Garbade, William Silber, and an anonymous referee for valuable suggestions and First Boston Corporation for providing the data.'The impact of the cost of transacting on price can be illustrated as follows (Amihud and Mendelson (1988a)): consider a stock which is expected to be traded once a year at a cost of 1 cent on the dollar value; discounting the infinite stream of transaction costs, at say 8%, gives a present value of 12.5 cents per dollar of value, which is the loss due to transaction costs or the discounted cost of illiquidity.