This paper portrays traders as firms that maximize revenues across markets, including the export market. We derive the properties of an export supply function and use these properties to estimate an export supply equation. The revenue-maximizing decision can help economists determine the amount trading companies should be compensated (taxed) in the wake of a change in government programs. For example, we show that economists can estimate compensation (tax) levels which ensure traders' revenues do not change from government policy changes. We illustrate our case by estimating barley supply equations.