http://www.freakonomics.com/2013/05/03/this-year%E2%80%99s-kentucky-derby-picks-and-a-brand-new-way-to-bet-on-them/ Levitt先生の今年の予想。 A Fascinating, But Costly, Kentucky Derby - Freakonomics Freakonomics Levitt先生の次回の予想にご期…