A crackdown on the sale of data from China’s sprawling statistics agencies has prompted a marked deterioration in the numbers investors rely on to understand the world’s second-largest economy.
Executives searching for figures on China’s petroleum exports or wind power output have noticed growing gaps in the numbers, with some data released later than expected or missing entirely. That has made it harder to assess the state of the broader economy and the many industries where the country has become the dominant producer or buyer of raw materials.
“It will quickly become an issue if it continues,” one oil trader at a non-
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