Table 1. Payoff matrix of the two-person Public Good Game with wealth inequality.

First player	Second player
	Rich site		Poor site
	Cooperate	Defect	Cooperate	Defect
Rich site
Cooperate	2c+1	c	c+1	c
Defect	bc+b+c	bc+b−1	bc+b	bc+b−1
Poor site
Cooperate	c+1	0	1	0
Defect	b+c	b−1	b	b−1