Last year Xi Jinping, China’s president, paid a visit to Heilongjiang in the country’s north-east. This province, part of the industrial rustbelt, exemplifies the problems besetting China’s economy. Its birth rate is the lowest in the country. House prices in its biggest city are falling. The province’s GDP grew by only 2.6% in 2023. Worse, its nominal GDP, before adjusting for inflation, barely grew at all, suggesting it is in the grip of deep deflation.