Download the following article by Hongbin Li, Pak Wai Liu, Ning Ma, and Junsen Zhang: "Does Education Pay in Urban China? Estimating Returns to Education Using Twins." You can find the article at this website: http://www.econ.cuhk.edu.hk/~discusspaper/00013.pdf.

Why is it interesting to use data on twins to estimate returns to education? Why is the estimate found by the authors lower than what ordinary least squares regression estimates typically give? How do these estimates compare to those for Indonesia discussed in the chapter? What is specific about Chinese educational institutions in the returns of high school, college, and vocational school education?