A spate of worrying economic data Thursday shook stock and bond markets. Economic activity in the 18-country euro zone expanded at a weak annual rate of 0.8% during the first quarter, data released Thursday showed. Excluding Germany, which grew at a robust 3.3% pace, the rest of the euro-area economy contracted slightly during the quarter. European Central Bank officials are now moving toward enacting additional low interest-rate policies to prevent the region from sliding into a lengthy period of economic stagnation, while the U.S. Federal Reserve guardedly tries to wind down a bond-buying program meant to revitalize economic growth. Meantime, Chinese authorities are trying to prod banks to lend more to first-time home buyers shut out of their real-estate market. U.S. officials privately say they expect Chinese officials to act to boost their economy and support banks if growth slows severely, though Chinese officials say they will avoid major […]