Kai Jia, a lecturer at the University of Electronic Science and Technology of China and visiting scholar at UC Davis, talks about two models of the sharing economy: one requires the platform to own little capital, like Airbnb and Uber (or Didi Chuxing, largest ride-sharing platform in China). The other model is capital intensive. The bike-sharing startups that have proliferated across China in recent years are an example of this. In this second model, the suppliers are not the consumers, Jia says, but rather, the suppliers are the companies. Because bike-sharing grew so quickly in China, the industry has very little regulation, and there are so many bikes that they have become a source of waste and overproduction rather than a means for creating more sustainable cities. On the positive side, bike-sharing apps are often far more convenient than alternative forms of transportation, and don't contribute to the pollution of China's cities. Jia argues for increased regulation of the sharing economy on the part of the government, and points out that Chengdu has recently issued guidelines around sharing university parking lots. The government can choose to either impose regulations on the platform itself, or on the behavior of the users, says Jia.