Thus, giving grades and promotions based only on an individual's performance relative to a small local group, as is common, may reduce cooperative behaviors in the group.
ðˈʌs, ɡˈɪvɪŋ ɡɹˈeɪdz ænd pɹəmˈoʊʃənz bˈeɪst ˈoʊnli ˌɔn ɐn ˌɪndᵻvˈɪdʒuːəlz pɚfˈoːɹməns ɹˈɛlətˌɪv tʊ ɐ smˈɔːl lˈoʊkəl ɡɹˈuːp, ˌæzˌɪz kˈɑːmən, mˈeɪ ɹᵻdˈuːs koʊˈɑːpɚɹətˌɪv bᵻhˈeɪvjɚz ɪnðə ɡɹˈuːp.