The benefits for the altruist may be increased, and the costs reduced by being more altruistic towards certain groups.
ðə bˈɛnɪfˌɪts fɚðɪ ˈɔːltɹuːˌɪst mˈeɪ biː ɪŋkɹˈiːst, ænd ðə kˈɔsts ɹᵻdˈuːst baɪ bˌiːɪŋ mˈoːɹ ˌɔːltɹuːˈɪstɪk təwˈɔːɹdz sˈɜːʔn̩ ɡɹˈuːps.