There are times when it pays to be the world’s leading economy. The greenback has traditionally been the number one haven for investors in difficult economic times. The luster of the greenback may be tarnished, but it is still proving more attractive than the alternatives. Commodity prices are tumbling and this is affecting the currencies of countries that are particularly dependent on export sales of their natural resources.  The prognosis for investment spending in the resource sector has suffered a setback.