For example, Team A wants to exchange 1 for Team B's 2. As long as both players are in the contract period, as long as both parties agree to exchange with each other and the exchange conforms to the regulations, even if the players disagree, there is no way. For example, Marion was traded by the Sun to the Heat. Although Marion himself was reluctant, there was nothing he could do.

In line with the rules of player exchange, it is very important that the salary should be balanced, that is, the annual salary of two players should be roughly equal, and the difference should not exceed 15% (it is said that it is 20%).

Another phenomenon is that when a team really wants to sign a contract with a player, the player can put forward "I need a right to veto the transaction", that is, if the two teams A and B reach an agreement and decide to exchange, but one of the players who exchange has this right, then as long as he does not want to exchange, he can exercise this right to veto the transaction, and then the transaction will fail. This is to protect their own interests.

What 5L said should not be player options, but trading veto. Player options are different from forced trading. The player's option is an additional clause of the contract. For example, if a player has signed a five-year contract with the team, he can ask for 4+ 1 year. Four years is a regular contract. Finally, 1 means that the player has the right to decide whether I will stay in this team for another year. If a player retires early, he will certainly decide to stay for another year, because he can get an extra year's salary if he doesn't play. In many cases, he decided not to stay in this team for the last year. For example, this year's Turkoglu, his annual salary is more than 600W, which he signed five years ago. Five years ago, he was still worth it, but this year he performed very well, far exceeding this price. If he signs this year, he can get1000 w. Then, of course, he will give up the contract of 600W in the last year and sign a new contract above1000 W. The player option is a clause for the player to seek the best interests for himself. Correspondingly, teams also have team options, similar to player options.