The President of Bolivia, Evo Morales, celebrated May Day by ordering soldiers to occupy his country's natural gas fields. The purpose of this exercise was not military, but economic: Morales has demanded that all foreign companies currently operating these fields must sign a contract with Bolivia that would allow them to retain only 18% of the production, while the remainder would go to Bolivia's state-owned oil company. The 18% concession to the foreign companies was not an act of generosity on the part of Morales, but simply of expediency: Bolivia needs these companies to tap its natural gas resources, because...