ominique Strauss-Kahn, the head of the International Monetary Fund, suggested Friday the organization might one day be called on to provide countries with a global reserve currency that would serve as an alternative to the U.S. dollar. "That day has not yet come, but I think it is intellectually healthy to explore these kinds of ideas now," he said in a speech on the future mandate of the 186-nation Washington-based lending organization. Strauss-Kahn said such an asset could be similar to but distinctly different from the IMF's special drawing rights, or SDRs, the accounting unit that countries use to hold...