A public--a lot of companies don't want to be public because you can't keep secrets very well; you've got to regularly put those things up online and they're out there for everybody to see.

很多公司不愿意上市,因为这样就无法保守公司机密,你必须定期把公司信息公布到网上,让全世界都看得到

耶鲁公开课 - 金融市场课程节选