Quote Originally Posted by spoonitnow View Post
It's not so much about the stack/pot sizes as it is about his alternative option to betting being folding. Folding has an EV of 0. If your alternative option to betting is checking, then this isn't the case (checking has an EV > 0).
Ah right i get it now, why would he choose an inferior option, he can fold and gain 0 EV or shove and gain some EV. And we're always trying to take the option with the greatest EV.