Table 1.

Comparison of model predictions for changes in the subordinate's share as each parameter changes (other parameters held constant)

	Pure transactional (complete dominant control with transactions)	Pure tug-of-war (incomplete control)	BTOW (incomplete control with transactions)
Leaving payoff s increased	+	0	+
Payoff for sole possession of nest or territory t increased	+	0	− (f < 1/2)
Relatedness increased	−	0	0
Subordinate's fighting ability increased	+	+	+
Maximal group output G increased	−	0	0

We assume (i) the fighting and leaving noncooperative option and (ii) the payoff for winning the fight to retain the nest or territory t is greater than the payoff s for having to leave if the fight is lost. 0, the model predicts no effect on the subordinate's share; −, there is a predicted decrease; +, there is a predicted increase.