It used to be regarded as too lowly for college students to sell from stalls. But now more and more students try to become street vendors in their spare time. Not all of them aspire to become like Li Kengqiang, brand owner of “Dr Sweet Potato”, a college grad who earned a monthly income of 15,000 yuan by selling grilled sweet potato on a campus in Changsha. Most do it to learn career lessons. Xu Jingxi talked to three student vendors.