Ka'idar kariya (protectionism) ta buƙaci Gwamnati ta shiga tsakani domin samun daidaito a cinikayyar ƙasashen waje. Manufar kariya ita ce yin tasiri ga daidaiton ciniki da kuma gyara gibi, saboda daidaiton da ke faruwa ta halitta tsakanin fitar da kaya da shigo da kaya ba zai iya samar da daidaito ba, haka kuma ba zai iya gyara gibi ba. Saboda haka, kariya za ta zama wajibi, kuma shi ya sa za a sanya harajin kwastam da takunkumi kan shigo da kaya da fitar da kaya.

The protectionist theory requires that a State interferes in order to achieve equilibrium in foreign trade. The pupose of protectionism is to influence the balance of trade and redress the deficit, because the spontaneous balance between exports and imports would not be able to achieve equilibrium, nor would it be able to redress a deficit. Therefore, protectionism would be necessary, and that is why custom duties as well as export and import restrictions would be imposed.

Wannan ka'ida kamar yadda take a yanzu tana da iyaka, domin tana takaita ikon Dawla na shiga tsakani kawai don cimma daidaiton cinikayya da ƙasashen waje ko don rage gibi. Wannan kuskure ne, saboda Dawlar Musulunci tana shiga tsakani don mu'amala da sauran ƙasashe bisa ka'idar musayar alheri, don biyan buƙatun ƙasa, don samun riba ta kuɗi da kuɗaɗen waje, kuma sama da duka, don isar da kiran Musulunci. Saboda haka, bai dace a iyakance shiga tsakanin Dawla ga cimma daidaito a cikin hada-hadar cinikayya da rage gibi kawai ba. A maimakon haka, shiga tsakanin ta ya kamata ya kasance don manufofin siyasa, tattalin arziki da kasuwanci, da kuma isar da Saƙon Musulunci.

This theory as it stands is limited, because it restricts the State’s powers to interfere merely to achieve a foreign balance of trade or to redress the deficit. This would be wrong because the Islamic State interferes in order to deal with the other states with reciprocity, to provide the country’s needs to generate monetary gains and foreign currencies and, most importantly, to carry the call for Islam. Therefore, it would be wrong to confine the interference of the State to achieving equilibrium in trade transaction and to redress the deficit. Rather, her interference should be for political, economic and commercial aims and for carrying the Islamic Message.