如果上涨，出手后再买就贵了，留着还是按原来算。

如果下降，就可以空出空间。

Update Unit Values
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Clicking on this link will adjust downward the salary you allot to players on your team whose salaries have decreased since you acquired them. It brings your Team Value in line with the player's current market value, freeing up cap room for you to use on other player moves.

So, assume you have $25 million allotted to Priest Holmes, but his current market value drops to $15 million. By clicking the "Update Unit Values" link, you will lower his salary to $15 million. This frees up $10 million for other moves.

Using this feature will automatically adjust the salaries for every player on your team whose salary has decreased since you acquired them.

If a player's salary has increased since you acquired him, his salary WILL NOT be adjusted upward on your roster when unit values are updated. However, if you sell this player, you must pay the current market value to reacquire him.