Assertion: altruism | /r/HasProperty | costly
Facets:
value: for such a convert
type: TRANSITIVE-OBJECT
Source sentences:
text: Condition 1 shows that altruism is costly for such a convert; that is, α i+1 −β
text: Altruism can be expensive.
text: Thus, altruism is costly to self, but is a benefit to others.