The producer price index (PPI) tumbled 2.7 per cent after a 3 per cent fall in November, marking the 15th straight month of declines. Analysts had expected a 2.6 per cent slide in December.

The latest data underscores the broader weakness in demand across the economy, keeping policymakers alert to any entrenched expectations of price falls. China’s central bank has pledged to step up macroeconomic policy adjustments to support the economy and drive a rebound in prices.