text: Yoram Ben-Porath introduced a production function for this concept to predict its rate of creation.
full_question: Yoram Ben-Porath introduced a production function for this concept to predict its rate of creation. Mankiw, Romer, and Weil argued that introducing this concept to the Solow Model was necessary for its predictions to corroborate real-world data. Theodore Schultz wrote the paper that formally introduced this concept in 1961. Signaling theory is an alternative to the argument that people are producing this thing by receiving education. A Gary Becker book about people investing in themselves is named after, for 10 points, what non-physical variety of one of the four factors of production?
first_sentence: Yoram Ben-Porath introduced a production function for this concept to predict its rate of creation.