In Escaping the Resource Curse, Columbia University professors Macartan Humphreys, Jeffrey Sachs and Joseph Stiglitz identify a vast array of contributing causes to the resource curse. Corruption is among the most severe, they conclude. “The short run availability of large financial assets increases the opportunity for the theft of such assets by political leaders. Those who control these assets can use that wealth to maintain themselves in power, either through legal means (e.g., spending in political campaigns) or coercive ones (e.g., funding militias).” Local corruption, they note, is often aided and abetted by international companies. “International mining and oil companies that seek to maximize profits find that they can lower the costs of obtaining resources more easily by obtaining the resources at below market value — by bribing government officials — than by figuring out how to extract the resources more efficiently.”