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a. What are the three eras regarding the history of human population growth, and what are the characteristics of each era? According to Galor and Weil (2000), what are the major economic forces that drive the transition from a Malthusian economy to a modern growth economy? b. Choose five highincome countries and five lowincome countries. For each country, find data on average years of schooling and the total fertility rate (TFR) in year 2015. c. What differences can you tell between high- and low-income countries regarding education level and fertility rates from Part (b)? Use Quantity-Quality Tradeoff theory to explain the differences