How was William F. Sharpe awarded the Noble Prize in Economics?

Name: William F. Sharpe.
Real Name: William Forsyth Sharpe.
Country: United States.
Date of Birth: June 16, 1934.
Education: Graduate from Riverside Polytechnic High School in 1951, and BA, MA, Doctor of Philosophy (Ph.D.) from University of California, Los Angeles.
Subjects Of Study: Finance beta capital asset pricing model.
Popularly Known: Developing the capital asset pricing model (CAPM).
Noble Prize Year: Nobel Prize for Peace in 1990, for their pioneering work in the theory of financial economics.