James M. Buchanan, the U.S. economist who won the 1986 Nobel Prize for applying the principles of economic self-interest to understand why politicians do what they do, has died. He was 93.
President Barack Obama is nominating Allison Macfarlane, a professor and member of panel studying disposal of atomic wastes, to lead the Nuclear Regulatory Commission, replacing Chairman Gregory Jaczko, who is quitting.
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