Morality banks have popped up in several Chinese cities in recent years, although some critics feel they are too materialistic, Xinhua notes. But in Yanji the bank is proving popular - more than 600 people have joined since it opened two weeks ago, according to one local official. Among them are many local school children. One teenager, filmed cleaning up a yard with his classmates, told local Yanji TV : "We can be proud and excited that we're doing good things and being good people."