A few months ago, a small entrepreneur in Nanjing who makes cheap souvenirs sold in Chinese railway stations and local airports borrowed a modest sum from an internet loan shark to pay his staff as his business slowed and cash flow dried up. Although the terms were punishingly high — 1 percent per day — he thought the slowdown would prove temporary. But the debt crippled him and he was forced to shut down his small enterprise.

Today there are more than 2,000 peer-to-peer lenders in China. Some of them are outright frauds, enticing lenders to hand money to non-existent borrowers. Others are loan sharks, charging exorbitant interest to customers desperate for short-term funds, as in Nanjing. And others extend credit on reasonable terms to small and medium enterprises, and individual entrepreneurs, who are either too insignificant or too iffy for the banks.