For more than a quarter-century, China has been synonymous with relentless development and upward mobility. As its 1.4 billion people gained an appetite for the wares of the world — Hollywood movies, South Korean electronics, iron ore mined in Australia — the global economy was propelled by a seemingly inexhaustible engine.Now that engine is sputtering, posing alarming risks for Chinese households and economies around the planet. Long the centerpiece of a profit-enhancing version of globalization, China has devolved into the ultimate wild card in a moment of extraordinary uncertainty for the world’s economy.The risks have been amplified in recent weeks by a slew of developments.First came word that China’s economy had slowed substantially in the spring, extinguishing hopes of a robust expansion following the lifti …
