The Red Sox are one of the teams in baseball that uses a strategy called moneyball as a large part of their team building philosophy. While they use a good portion of this tactic, they didn't invent it or make it popular. Bill James is mainly responsible for this philosophy of baseball and Oakland A's general manager Billy Beane help put it on the map. The movie "Moneyball" is about Beane and how he implemented this approach to his own team.
After being eliminated by the New York Yankees in the 2001 playoffs, a trio of star players become free agents and leave the Oakland A's for greener pastures. Johnny Damon signed with the Red Sox, Jason Giambi went to the Yankees, and Jason Isringhausen joined the St. Louis Cardinals. Realizing that these moves could severely hurt his team, Billy Beane (Brad Pitt) asks the team's front office for more money and is rejected. After meeting Peter Brand (Jonah Hill), Beane decides to resort to an unorthodox way of building a team by utilizing what is called moneyball or sabermetrics.