选择你感兴趣的两个国家——一个富一个穷。每一个国家的人均收入是多少?找一些可能有助于解释收入差别的国家特
Choose two countries that interest you——one rich and one poor. What is the income per person in each country? Find some data on country characteristics that might help explain the difference in income: investment rates, population growth rates, educational attainment, and so on. (Hint: The Web site of the World Bank,www.worldbank.org,is one place to find such data.) How might you figure out which of these factors is most responsible for the observed income difference?