This research examines the arbitrage condition between Financial markets and commodity markets According to the standard arbitrage condition, for risk-neutral investors to be indifferent between holding securities or commodities, the expected commodity price appreciation, adjusted for physical storage costs, must equal the rate of return on financial assets For agritcultural commodities, however, the convenience yield drives a wedge between the interest return and the commodity price spread Empirical results support this position, but also provide evidence that the commodity price spread properly incorporates interest costs