CHINA has lots of people, not much oil and rulers who love big projects. Small wonder that makers of electric cars see it as the market of the future. The Chinese government wants to have 500,000 electric cars, lorries and buses on the country’s roads by 2015 and 5m by 2020. It is providing customers with subsidies worth up to 60,000 yuan ($9,250) and other incentives, too. If it carries on doing so, electric cars and plug-in hybrids could account for 7% of new-car sales in China by 2020, assuming an oil price of $130 a barrel, says a forthcoming report by the Boston Consulting Group (see chart). That would make China the biggest market for electric vehicles, by volume, in the world.