Read Greg Mankiw, Romer and Wiel's article in The Quarterly Journal of Economics.
https://www.amenezes.uac.pt/macroeconomiaII/macroeconomiaII_20062007/papers/mrw1992.pdf
https://eml.berkeley.edu/~dromer/papers/MRW_QJE1992.pdf
1. Many economists think the Solow Growth Model is of limited use. Does the Solow model give "...the right answer to the questions it is designed to address?"
2. Why is human capital important when testing the Solow model against the data?
3. Explain how the authors conclude that the incomes of the world's nations are converging?