Yong Yoon Chulalongkorn University   Faculty of Economics Chullaongkorn University Phayathai Rd., Pathumwan Bangkok, 10330 Thailand   yong.y@chula.ac.th   https://www.econ.chula.ac.th/           JEL Areas: O4 : Economic Growth and Aggregate Productivity: General C4 : Econometric and Statistical Methods: Special Topics