I muri mai, i whakaaetia neologism o McKenzie e tetahi atu economist American, James M. Buchanan, rite te ingoa mo te hou mātauranga iti-āpiha. Ko te mahi a Buchanan i runga i tenei iti-āpiha i kawea ia te Nobel Memorial Prize i roto i Economic Sciences i roto i 1986. Constitutionalism kua te kaupapa o te whakahe mo tona korenga o mua o ngā take o te ohaoha, engari i tangohia tenei whakahe i roto i te whanaketanga o te ohaoha constitutional. Buchanan ka karanga i te tikanga o te ture ture o te tangata i te mutunga o te rau tau 19th, "Buchanan Smith, e taea hoki te whakamahi i te tikanga o te ture o te tangata ki te whakamahi i te tikanga o te ture o te tangata, me te mahi i te tikanga o te ture o te tangata ki te whakarite i te tikanga o te ture o te tangata, me te whakamahi i te tikanga o te ture o te ture o te tangata i roto i te tikanga ohaoha, me te mahi i te tikanga o te ture o te tangata ki te whakamahi i te tikanga ohaoha i roto i te tikanga ohaoha, i te tikanga
Ko James M. Buchanan