it’s the Purdy effect.
In the NFL, when a team signs a player, that team has to put that player's guaranteed money into an escrow account. Purdy's extension most likely will contain roughly $160 million in total guarantees. That's a lot of cash.
And the 49ers probably didn't have much liquidity before selling this stake in their franchise considering they also own two soccer teams -- Leeds United and Rangers FC. And those teams are expensive to run and maintain.
Now, if the 49ers and Purdy have agreed upon the terms of his deal, they actually can finalize it. This will be the most lucrative contract the 49ers ever have given to a player. They've never had to put this much money into an escrow account at one time before.