Table 1.

Payoff structure of the three experiments

Experiment/condition	Option	Subject’s payoff	Partner’s payoff
Experiment 1	A		••
	B	••
	C	••	••
Experiment 2	A		•••
	B	••••
	C	•••	•••
Experiment 3 RA and NA	A		••
	B	••
	C	••	••
Experiment 3 NRA	A
	B	••
	C	••	••

Dots represent pieces of food.