Two UCLA economists say they have figured out why the Great Depression dragged on for almost 15 years, and they blame a suspect previously thought to be beyond reproach: President Franklin D. Roosevelt. After scrutinizing Roosevelt’s record for four years, Harold L. Cole and Lee E. Ohanian conclude in a new study that New Deal policies signed into law 71 years ago thwarted economic recovery for seven long years. “Why the Great Depression lasted so long has always been a great mystery, and because we never really knew the reason, we have always worried whether we would have another 10- to 15-year economic slump,” said Ohanian, vice chair of UCLA’s Department of Economics. In an article in the August issue of the Journal of Political Economy, Ohanian and Cole blame specific anti-competition and pro-labor measures that Roosevelt promoted and signed into law June 16, 1933.