Supply and demand is very much what 51job (JOBS), the Chinese employment and human resources services company is all about. When 51job was founded in the 1990s, finding a job (or an employee, for that matter) meant checking the listings in a weekly employment newspaper. The company excelled at getting employment news out and still publishes millions of paper copies of its recruitment newsletter every week in the 16 Chinese cities it covers. But the real action now is at 51job.com, the company’s website. The site has over 45 million registered members and a database of 36 million résumés....