The Chinese mega-city of Shanghai has been cracking down on popular taxi-booking apps, banning their use during rush hour. The government says apps discriminate against older people and those who don't have smartphones.
But economists and some customers see the crackdown as a small, textbook case of something much bigger: the battle between the government and market forces in the world's second-largest economy.
The apps are designed to address a supply and demand problem. Shanghai has at least 50,000 cabs but nearly 24 million people, according to the government.