Aristotle made substantial contributions to economic thought, especially to thought in the Middle Ages.
ˈæɹɪstˌɑːɾəl mˌeɪd səbstˈænʃəl kˌɑːntɹɪbjˈuːʃənz tʊ ˌiːkənˈɑːmɪk θˈɔːt, ɪspˈɛʃəli tə θˈɔːt ɪnðə mˈɪdəl ˈeɪdʒᵻz.