We analyze bargaining situations where the agents' payoffs from disagreement depend on who among them breaks down the negotiations. We model such problems as a superset of the standard domain of Nash [Nash, J.F., 1950. The bargaining problem. Econometrica 18, 155–162]. On our extended domain, we analyze the implications of two central properties which, on the Nash domain, are known to be incompatible: strong monotonicity [Kalai, E., 1977. Proportional solutions to bargaining situations: Interpersonal utility comparisons. Econometrica 45, 1623–1630] and scale invariance [Nash, J.F., 1950. The bargaining problem. Econometrica 18, 155–162]. We first show that a class of monotone path rules uniquely satisfy strong monotonicity , scale invariance , weak Pareto optimality , and “continuity”. We also show that dropping scale invariance from this list characterizes the whole class of monotone path rules. We then introduce a symmetric monotone path rule that we call the Cardinal Egalitarian rule and show that it is weakly Pareto optimal, strongly monotonic, scale invariant , symmetric and that it is the only rule to satisfy these properties on a class of two-agent problems.