Trade. I was going to blog about this actually. 2014 team leader's in WAR from players acquired by trade: CLE 30.1 OAK 26.5 DET 20.7 WAS 18.3 TOR 17.9 SDP 17.6 BAL 17.4 TBR 17.1 KCR 15.8 CHC 14.2 LAD 10.8 CHW 9.4 MIA 8.9 LAA 8.4 PIT 8.2 NYY 6.9 STL 6.6 SFG 5.6 MIL 5.1 BOS 4.6 TEX 4.4 COL 3.8 HOU 2.9 NYM 2.5 CIN 2.3 SEA 1.6 ATL 1.4 ARI -0.3 MIN -0.3 PHI -0.4 In 2014, team WAR from trade acquisitions had a .48 correlation to wins. Stronger than WAR from the draft (.35), WAR from free agents (.29), WAR from Amateur FA's (.15), or WAR from Waivers, which, interestingly, had a negative correlation to wins (-.29). In fact, WAR from trade acquisitions had a stronger correlation to Wins than (SO/9 (.32), Home runs allowed/9 (-.39), OBP, SLG, LOB, home runs, or strikeouts (either batting or pitching). The correlation of trade-acquired WAR to team wins was about the same as BB/9 (-.49) and OPS+ (.52). So yeah, I think successful teams are looking to trades for talent. Additionally, I'm coming around to thinking that there's probably no better way to judge a GM than by his +/- WAR on trades.