Head smashing was also present enough in episode 5x09 to give us reason to believe Negan is around. When Noah found his old house, he found his mother with her head smashed in the living room. Very similar to what Negan did to Glenn.
A trade-off is a situation where you make a compromise between two things, or where you exchange all or part of one thing for another. ...the trade-off between inflation and unemployment. American English: trade-off
A trade bloc is an agreement where regional barriers to trade are reduced or eliminated among the participating states. Trade blocs can be stand-alone agreements between several states, such as the North American Free Trade Agreement (NAFTA) or part of a regional organization, such as the European Union.