Chinese officials tend to report only good news and bury bad news for propaganda purposes and career advancement. That is why it came as a genuine surprise when, on July 22, Zhang Enhui, the party chief of Changchun, an industrial powerhouse known for its automobile sector and technological research, publicly broke with that tradition. He warned of “unprecedented difficulties and challenges” facing the city’s economy. The remark was apparently swiftly scrubbed from the city government’s website,...