How was Merton Miller awarded the Noble Prize in Economics?

Name: Merton Miller.
Real Name: Merton Howard Miller.
Country: United States.
Date of Birth: May 16, 1923.
Died: June 03, 2000.
Education: Undergraduate from Harvard University, Ph.D. in economics from Johns Hopkins University, and  Doctorate was from London School of Economics.
Subjects Of Study: Finance Modigliani-Miller theorem.
Popularly Known: The development of the Modigliani-Miller theorem.
Noble Prize Year: Nobel Prize for Peace in 1990, for their pioneering work in the theory of financial economics.