Research shows that it can be beneficial to help others if there is a chance that they will reciprocate the help.
ɹᵻsˈɜːtʃ ʃˈoʊz ðˌɐɾɪt kæn biː bˌɛnɪfˈɪʃəl tə hˈɛlp ˈʌðɚz ɪf ðɛɹ ɪz ɐ tʃˈæns ðæt ðeɪ wɪl ɹᵻsˈɪpɹəkˌeɪt ðə hˈɛlp.