Cоmpаnies ABC аnd GDL eаch оwn 3 cоnstrictor flange tool and die machines (“constrictors”) and 3 robotic assembly resonators (“resonators”). For GDL, a constrictor is worth 4 utils (a util being a uniform measure of utility) and a resonator is worth 1 util. For ABC, a resonator is worth 4 utils and a constrictor is worth 1 util. What can we say about potential constrictor/resonator trades that would leave both ABC and GDL “better off” than they are now (i.e. before any trade)?