Table 1. Assessments of the donor (either G or B for good or bad) for different social norms.

	ij: donor’s action i and recipient’s reputation j
Social norm	CG	DG	CB	DB
Scoring	G	B	G	B
Shunning	G	B	B	B
Simple Standing	G	B	G	G
Staying	G	B	—	—
Stern Judging	G	B	B	G