Price and Performance: Of Lions and Asses

“An army of asses led by a lion is better than an army of lions led by an ass” - George Washington The Red Sox must rely on their offensive leadership...but who exactly are they? The Sox are moving away from their recent Moneyball roots. But is the problem analytics or identifying and paying players most likely to produce? Establishing a cause and effect relation for statistics isn't easy. For example, we know that the most productive players invariably have productive statistics. But we can't a priori know that players who have had excellent statistics will continue to do so. Age, injury, illness, lack of motivation, personal problems (e.g. alcohol or substance abuse), or statistical variation can change productivity. Consider the complex decision-making surrounding free agent Jacoby Ellsbury. At the end of the 2013 season, the Red Sox had to decide their commitment to their free agent outfielder. In his "peak" (age 27) season, he was runne...