Fei Peng Centre for Research on the Economy and Workplace (CREW) , Birmingham Business School   CREW Birmingham Business School University House, Edgbaston Park Road Birmingham, B15 2TT UK   Pengfy@bham.ac.uk   http://ideas.repec.org/f/ppe229.html           JEL Areas: J3 : Wages, Compensation, and Labor Costs: General O4 : Economic Growth and Aggregate Productivity: General