This April 4, 2013 photo provided by the University of Chicago Booth School of Business shows Nobel Prize-winning University of Chicago economist Robert Fogel at his home in Chicago's H

 

              This April 4, 2013 photo provided by the University of Chicago Booth School of Business shows Nobel Prize-winning University of Chicago economist Robert Fogel at his home in Chicago
This April 4, 2013 photo provided by the University of Chicago Booth School of Business shows Nobel Prize-winning University of Chicago economist Robert Fogel at his home in Chicago's Hyde Park neighborhood. Fogel, whose work on the economics of slavery triggered a furious national debate, died Tuesday, June 11, 2013, after a brief illness. He was 86. Fogel wrote 22 books, the last one published in April. He first came to prominence in academic circles in the 1960s when he concluded that railroads weren't as important to the nation's economy as was widely believed. (AP Photo/Courtesy of the University of Chicago Booth School of Business, Dustin Whitehead)