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Paul Sancya/Associated Press

Before you read these words: Be wary.

The NFL offseason is not a zero-sum game. You can't just compare the new players that are inbound with the old players that are outbound and declare winners and losers.

Yes, it looks like that's exactly what's about to happen—but each of the following "Stock Up, Stock Down" slides were crafted with the consideration of whom the players are, how they fit into the scheme and what their future production might be.

For example: The loss of wide receiver Hakeem Nicks doesn't hurt the New York Giants much, because they have other receivers and seem to be generally over Nicks' inconsistency. The addition of Nicks to the Colts receiver corps is potentially huge, because they desperately need a player with his size and skill set.

Even with all the vagaries of projecting players onto different teams, there are some teams that so obviously got better that they couldn't be anything but "up" and teams that so clearly bled talent that they couldn't be anything but "down."

Here are 10 of the biggest stock-price swings of the first week of NFL free agency, and an up/down/hold verdict on the other 22.