Economist Eleni Gabre-Madhin outlines her ambitious vision to found the first commodities market in Ethiopia. Her plan would create wealth, minimize risk for farmers and turn the world's largest recipient of food aid into a regional food basket. "There is no place in the world and no time in history that small farmers have had to bear the burden of risk that African farmers bear today," Gabre-Madhin says. "But I'm not here to lament or wring my hands. I'm here to tell you that change is in the air.