Nadharia ya ulinzi wa biashara (protectionism) inahitaji kwamba Dola iingilie kati ili kufikia usawa katika biashara ya nje. Lengo la ulinzi wa biashara ni kuathiri mizani ya biashara na kurekebisha upungufu, kwa sababu usawa wa kawaida kati ya mauzo ya nje na uagizaji wa bidhaa kutoka nje haungeweza kufikia usawa, wala kurekebisha upungufu. Kwa hiyo, ulinzi wa biashara ungekuwa wa lazima, na ndiyo sababu ushuru wa forodha pamoja na vizuizi vya mauzo ya nje na uagizaji wa bidhaa kutoka nje vingewekwa.

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.

Nadharia hii kama ilivyo ni yenye mipaka, kwa sababu inaweka kikomo nguvu za Dola za kuingilia kati kwa lengo moja tu la kufikia usawa wa biashara ya nje au kurekebisha upungufu. Hili lingekuwa si sahihi, kwa sababu Dola ya Kiislamu huingilia kati ili kushughulika na nchi nyingine kwa msingi wa kulipizana, ili kutimiza mahitaji ya nchi, ili kuzalisha faida za kifedha na sarafu za kigeni, na, muhimu zaidi, ili kubeba da'wah ya Uislamu. Kwa hiyo, si sahihi kuzuia uingiliaji wa Dola kwa kufikia usawa katika miamala ya kibiashara na kurekebisha upungufu tu. Badala yake, uingiliaji wake unapaswa kulenga malengo ya kisiasa, kiuchumi na kibiashara, pamoja na kubeba Ujumbe wa Kiislamu.

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.