This undated photo provided by Northwestern University shows Dale Mortensen, a Nobel laureate and longtime professor of economics at Northwestern University. Personal assistant and close family friend Sue Triforo says Mortensen died Thursday, Jan. 9, 2014, at his home in Wilmette, Ill. He was 74. Mortensen shared the Nobel economics prize with two other Americans in 2010 for their work explaining how unemployment can remain high despite a large number of job openings. (AP Photo/Courtesy of Northwestern University, Lars Kruse) MANDATORY CREDIT
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