The U.S. economy is growing very slowly, just 0.4 percent in the first quarter, 1.3 percent in the second. And it might not do a whole better the rest of the year. That’s a problem. A recent study from the Federal Reserve finds that that since 1947, when two-quarter annualized real GDP growth falls below 2 percent, recession follows within a year 48 percent of the time. (And when year-over-year real GDP growth falls below 2 percent, recession follows within a year 70 percent of the time.