Salomonsson, Marcus - Economics Institute for Research (SIR), … - 2009
; �xation, assortative
group formation, and reproductive externalities.
Keywords: Altruism; spite; externalities; conformity … cooperation and altruism is provided by Leimar and
Hammerstein (2006).
3Regardless of how social preferences have been selected …
lead to less altruism.
Traulsen and Nowak (2006) provide a link between �xation models and the repro-
ductive externality …