ðɪs lˈɛd ɪn pɚtˈɪkjʊlɚ tʊ ɐ nˈaɪntiːnhˈʌndɹɪd nˈaɪnti ˈeɪt pˈeɪpɚ, wɪð dˈeɪvɪd blˈæntʃflaʊɚ, ɪnðə dʒˈɜːnəl ʌv lˈeɪbɚɹ ˌiːkənˈɑːmɪks wɪððə tˈaɪɾəl "wˌʌt mˌeɪks ɐn ˌɑːntɹɪpɹənˈʊɹ?".
This led in particular to a 1998 paper, with David Blanchflower, in the Journal of Labor Economics with the title "What makes an entrepreneur?".