How was Bertil Ohlin awarded the Noble Prize in Economics?

Name: Bertil Ohlin.
Real Name: Bertil Gotthard Ohlin.
Country: Sweden.
Date of Birth: 23 April 1899.
Died: 3 August 1977.
Education: Bachelor of Arts from Lund University (1917), Master in Science from Stockholm School of Economics (1919), Master in Arts from Harvard University (1923), Ph.D. from Stockholm University (1924).
Subjects Of Study: World War I international trade Germany Heckscher-Ohlin theory reparations.
Popularly Known: Heckscher–Ohlin model, and Heckscher–Ohlin theorem.
Noble Prize Year: Nobel Prize for Peace in 1977, for their pathbreaking contribution to the theory of international trade and international capital movements.