American stock markets responded enthusiastically to the news U.S. unemployment was 13.3 percent in May. If it seems inexplicable double-digit unemployment would thrill investors, there is a reason. The unemployment rate in April was higher at 14.7 percent, and analysts had forecast the rate in May would jump to 19.1 percent. All in all, that makes 13.3 percent look pretty attractive. There were some caveats.