How is that possible? As history has shown us, global economic uncertainty leads to global investors shifting their money to safer U.S. assets which drives up the value of the dollar since dollars are needed (think supply vs demand) to purchase these assets. This is depicted by the U.S. Dollar Index (DXY), which tracks the strength of the dollar against a basket of major currencies. The dollar has held its strength and reamined near the peak its 52-week high. U.S. Dollar Index goes up when the U.S. dollar gains "strength" (value), compared to other currencies. In particular, it has gained 7% against the Euro since it began its ascent last April, and nearly 10% against the Chinese Yuan over the same period.