This creator of the factor price equalization theorem also developed revealed preferences theory, and wrote 1947's Foundations of Economic Analysis.  
He retracted a theorem named for him and Levhari in the paper "The Nonswitching Theorem is False," and he gives his name to a hypothesis concerning the difference in productivity growth rate between tradable and non-tradable sectors, along with Balassa.  He created the "surrogate production function,"  while one his best known ideas was introduced in his paper "A Note on the Pure Theory of Consumers' Behavior."  This creator of the factor price equalization theorem also developed revealed preferences theory, and wrote 1947's Foundations of Economic Analysis.  FTP, name this economist who along with Nordhaus wrote the popular textbook Economics, and won the 1970 Nobel in Economics.
He retracted a theorem named for him and Levhari in the paper "The Nonswitching Theorem is False," and he gives his name to a hypothesis concerning the difference in productivity growth rate between tradable and non-tradable sectors, along with Balassa.  
Paul {Samuelson}