Jipp's Curve

August Jipp's 1963 article was the first to establish the link between telecommunication development and a country's income level.

Jipp, A.1963. "The Wealth of Nations and Telephone Density." Telecommunications Journal. Geneva: International Telecommunications Union.

Jipp plotted the relation between telephones per 100 inhabitants and per capita income with the resulting figure referred to as "Jipp's Curve."

Jipp's Curve