What does it take to produce stuff? On a basic level, you need means of production: raw materials, land, some machinery, some structure, and humans. Gross domestic product (GDP) is the measure of all the stuff produced in a country (in each quarter or each year) and depends heavily on the means of production. Today, we look at the human component. How much humans influence GDP depends on essentially two things: how much they work and how good they are at working. The latter is obviously a little difficult to measure, especially if you want to look at the input angle. We can measure output, which is labor productivity—that is, how much each unit of work produces. To measure human efficiency at working, though, economists use the concept of human capital, which is in some ways parallel to physical capital (machinery and structures) in the production process. When working, humans use their education, work experience, and intelligence to try to do more within the same amount of time. Human capital is a measure of all this.
When comparing nations, a good proxy for human capital is the average numbers of years of schooling. Economists have long used the Barro and Lee dataset and its revisions (see here and also here). But just adding up years of school doesn’t seem quite right. Indeed, the impact of 3rd grade in Nepal is likely not the same as 11th grade in Canada or 1st grade in Nigeria. To adjust this measure, economists use the returns (in earnings) to each additional year of education as measured by George Psacharopoulos. Once you apply those returns, which are different for every year of schooling and every country, to the average number of years of schooling in each country, you get the human capital index that is shown in the map above.
How this map was created: From GeoFRED, open the cogwheel, open the “Choose Data” panel, select “Nation” as region type, then search for “human capital” under “Data.”
Suggested by Christian Zimmermann.