From: Groupwise information sharing promotes ingroup favoritism in indirect reciprocity
Symbol | Meaning |
---|---|
M | Number of groups |
θ | Probability that a donor and recipient in a one-shot game are in the same group |
r∈{G, B}^{M} | Reputation vector of a player in the eyes of M observers |
p_{ k }(r) | Probability that a player in group k has reputation vector r |
p_{−k}(r) | Probability that a player outside group k has reputation vector r |
σ(r)∈{C, D} | Donor’s action to a recipient having reputation r∈{G, B} |
Φ_{ r }(a,r^{′}) | Probability that an observer assigns reputation r∈{G, B} to a donor selecting action a∈{C, D} to a recipient having reputation r^{′}∈{C, D} |
p_{in}(r) | Probability that a player in the eyes of an ingroup observer has reputation r |
p_{out}(r) | Probability that a player in the eyes of an outgroup observer has reputation r |