ELI5: Explain Like I'm 5

GDP density

GDP density is a measure of economic output per unit area. It is often expressed as the Gross Domestic Product (GDP) divided by the total land area of a country, region, or city. This measure helps economists and others understand how economically productive a certain area is, or how productive different areas are in comparison. For example, countries with higher GDP density are usually more economically prosperous than those with lower GDP density.