I've got another interesting and possibly worthless study for you (I should just make this a daily afternoon feature). The Wall Street Journal examined every offseason move and ranked each MLB team based on "the volume of moves it made and the net quality of the players it ended up with."
The Wall Street Journal has a bunch of statheads over there -- and there's nothing wrong with that -- so authors Scott Cacciola and Jared Diamond used projected Wins Above Replacement (WAR) to evaluate each offseason transaction.
What's WAR? Fangraphs explains it with a hypothetical: “If this player got injured and their team had to replace them with a minor leaguer or someone from their bench, how much value would the team be losing?” So if a player's value is 2.3, he is worth 2.3 wins to his team.