A spate of recent commentary has been warning of the vertiginous rise in China's debt, which jumped from 148 percent of GDP in 2007 to 249 percent at the end of the third quarter of 2015. Many are anxiously pointing out that China's debt is now comparable to that of the European Union (270 percent of GDP) and the United States (248 percent of GDP). Are they right to worry?

To some extent, they are. But while observers' concerns are not entirely baseless, it is far too early to sound the systemic-risk alarm. For starters, China has a very high savings rate - above 45 percent over the last decade, much higher than in the advanced economies - which enables it to sustain higher debt levels.

Moreover, China's banking system remains the primary channel for the deployment of the household sector's savings, meaning that those savings fund corporate investment through bank lending, rather than equity financing (which accounts for only about 5 percent of net investment). Indeed, the sharp acceleration in the debt-to-GDP ratio is partly attributable to the relative underdevelopment of China's capital market.