China must learn lessons from its stock market rout, the country’s vice finance minister said on Saturday, signaling his intent to focus on supervision and the development of new frameworks to make it possible to weather any future market turbulence. China’s stock market plunged by nearly a third at one stage earlier this month from a mid-June peak, wiping around $4 trillion from share values as investors were spooked by speculation that China’s central bank was about to end its monetary policy easing.