Dividing countries into “less developed” and “more developed” does not
help much either, because it is unclear where to draw the line between the two groups. In the absence of a single criterion of a country’s development, such divisions can only be based on convention among
researchers. For example, it is conventional in the World Bank to refer to low-income and middle-income countries as “developing,” and to refer to high-income countries as “industrial” or “developed.”