Given how the market in Major League Baseball works today, prospects have become more valuable than ever.
Teams are finding that it costs less to promote, say, a back-end starter who will only cost $500,000 in pre-arbitration years from the minors than to give $45-50 million to a mid-rotation pitcher like Ricky Nolasco or Matt Garza.
Because of this new market inefficiency, teams are less likely than ever to trade prospects they have multiple years of control over.
The biggest prospect traded so far this offseason is Matt Davidson, who went from Arizona to the Chicago White Sox in exchange for closer Addison Reed. I like Davidson as a third baseman with above-average power and contact issues, but he's not a star.