He hadn't 'bargained on' how his new position in the company would change the way people treated him. [=he was surprised by how his new position changed the way people treated him]
You're allowed to go to the football game tonight, but I expect you to 'keep your side of the bargain' [=do what you agreed to do] and clean your room.
They've agreed to turn the land over to the state, and the state, as its part of the 'bargain', has agreed to keep it undeveloped.
(..) I can lie low there, maybe sniff out a job when things quiet down. You? Stateside. Send my regards. He sold you out. Thought to come to me and bargain for his life. So I offer you the satisfaction. It's not the way I deal with things. - What will you do with him? - Nothing. (..)2010 Inception