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The advantage of having a good agent is that you can present any demands to him, and after reaching an agreement, he will go all out to negotiate on your behalf and achieve your objectives.
As for the player themselves, they only need to await news and focus on playing well, without getting dragged into complicated, lengthy negotiations that could involve trickery or even succumb to public pressure.
At that time, there were no standardized contracts, and there was no fixed standard for contract amounts, so all contracts were negotiated between players and teams.
Therefore, teams often used various means to pressure players, forcing them to agree to terms that were unfavorable to the players but beneficial to the teams.
If the agent was inexperienced or incompetent, he would only glance at the contract, likely allowing the team to dominate the discussions and possibly even turn against the player, colluding with the team to take advantage of the player.