We learned yesterday that business activity in the U.S. picked up in August, led by a big advance in the manufacturing sector. Manufacturing had been in a slump, but recorded its strongest growth in orders in 18 months. Is it the start of a bigger trend or just a blip? Then, Evergrande — once one of China's biggest property developers — is having its shares delisted from Hong Kong's stock exchange. Its ruinous downfall has threatened to weigh down the world's second-largest economy.