lˈeɪɾɚɹ ɪnðə nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi z, hiː wˈɜːkt ˌɔn θiəɹˈɛɾɪkəl ˈæspɛkts ʌv lˈeɪbɚ kˈɑːntɹækts, wɪð pˈeɪpɚz ɪnðə nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi sˈɪks ɐmˈɛɹɪkən ˌiːkənˈɑːmɪk ɹᵻvjˈuː ænd ðə nˈaɪntiːnhˈʌndɹɪd ˈeɪɾi fˈoːɹ kwˈɔːɹɾɚli dʒˈɜːnəl ʌv ˌiːkənˈɑːmɪks.
Later in the 1980s, he worked on theoretical aspects of labour contracts, with papers in the 1986 American Economic Review and the 1984 Quarterly Journal of Economics.