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| Logan Mankins (70) was dealt to Tampa Bay, but will the Patriots suffer for it? |
Trades in the NFL happen significantly less frequently than they do in the NBA, NHL, and in Major League Baseball. There are a few reasons for this - first and foremost, contracts are structured in the most complicated fashion of the four major sports. There's the total value of the contract, which is split into a signing bonus (guaranteed money) and the player's yearly salary (often un-guaranteed or only partially guaranteed). Those two numbers are then used to calculate a player's "cap hit," or what figure they actually count against the team's salary cap. As NFL contracts are more complicated, it becomes more difficult to trade players for other players - almost exclusively, you see players traded for draft picks.
Trades happen infrequently in the NFL, unless you're talking about the Patriots in the two-week window before the regular season starts.

