French economist and academic Thomas Piketty, in his book-lined office at the French School for Advanced Studies in the Social Sciences, in Paris, earlier this month. Charles Platiau/Reuters/Landov hide caption

itoggle caption Charles Platiau/Reuters/Landov

The Royal Swedish Academy of Sciences announces the winners of the 2013 Nobel Memorial Prize in Economic Sciences in Stockholm Monday. The prize went to U.S. professors Eugene Fama, Lars Peter Hansen and Robert Shiller. Claudio Bresciani/AP hide caption

itoggle caption Claudio Bresciani/AP

The line outside an employment office in Madrid last October. Spain's economy has been among the hardest hit in Europe. Dominique Faget /AFP/Getty Images hide caption

itoggle caption Dominique Faget /AFP/Getty Images