SAN NARCISO, Calif. (Bennington Vale Evening Transcript) -- Since the early 2000s, Walmart executives, shareholders and Wall Street investors have worried about living conditions in third world countries. "Like all large companies that rely on manufacturing and distribution, Walmart has focused heavily on issues of human rights, forced labor and health factors," said Len Waybill, head economist for the conservative Peter Pinguid Society. "If a developing nation's environment turns inhospitable, the vital supply of child workers dwindles to unsustainable levels. That drives up the cost of goods, and could subsequently destroy Walmart margins and the value of its stock -- an unthinkable, apocalyptic scenario." On Thursday, those fears became a reality after a study conducted by Medicine sans Frontier (MSF) found child mortality rates in South Sudan far surpassing emergency levels for the region.