IQ and the Wealth of Nations.
本书提出国家间智商差异是解释财富差距的关键因素，但评论者认为其证据不足，仅依赖简单相关且未控制其他变量，对经济学者的参考价值有限。
In this thought‐provoking book, Lynn and Vanhanen present the hypotheses that there are significant differences in the distribution of intelligence across countries and that 'national intelligence' is a major explanatory factor of a country's wealth. By drawing on results and methodology from their respective disciplines of psychology and political science, the authors attempt to motivate and test these controversial hypotheses. Do we as economists have something to learn from this book? This reviewer remains unconvinced. First, the authors fail to establish the reliability and cross‐country comparability of intelligence (IQ) test scores. Second, the book's strong conclusions rest on simple bivariate correlations between IQ scores and income per capita levels. The empirical estimates fail to control for alternative explanations of income differences across countries and completely ignore the fact that correlation need not imply causation. It is unclear how a critical reader would change her prior assessment on the topic after reading the book.