China’s export and import performance in September easily beat forecasts, with imports showing unexpected buoyancy, helping to ease concerns about deteriorating domestic demand in the world’s second-biggest economy. “The big implication is that import (growth) is much stronger, so that no matter what is the reason, I think it will cool off a bit of the concern about domestic weakness bringing down economic activity,” said Zhu Haibin, an economist at JPMorgan. China’s economy, the world’s second largest, has had a bumpy ride this year.