Economists measure the total factor productivity of agriculture, according to which agriculture in the United States is roughly 1.7 times more productive than it was in 1948.
ɪkˈɑːnəmˌɪsts mˈɛʒɚ ðə tˈoʊɾəl fˈæktɚ pɹˌɑːdəktˈɪvᵻɾi ʌv ˈæɡɹɪkˌʌltʃɚ, ɐkˈoːɹdɪŋ tʊ wˌɪtʃ ˈæɡɹɪkˌʌltʃɚɹ ɪnðə juːnˈaɪɾᵻd stˈeɪts ɪz ɹˈʌfli wˈʌn.sˈɛvən tˈaɪmz mˈoːɹ pɹədˈʌktɪv ðɐn ɪt wʌz ɪn nˈaɪntiːnhˈʌndɹɪd fˈoːɹɾi ˈeɪt.