Nadharia ya biashara huria inasema kwamba miamala ya kibiashara kati ya nchi inapaswa kufanywa bila vikwazo, bila ushuru wa forodha wala kizuizi chochote cha uagizaji wa bidhaa. Mrengo huu wa kifikra unatetea kuondolewa kwa udhibiti wa Dola. Dola isingelazimika tena kudhibiti uagizaji na usafirishaji wa bidhaa nje, kwa sababu usawa kati ya uagizaji na usafirishaji ungepatikana kwa nguvu za kiasili. Kwa hiyo, usawa huo ungetokea kwa njia ya kiasili na kiotomatiki.

The theory of free trade states that trade transactions between countries should be conducted without restrictions, customs duties or any obstacle to imports. This school of thought champions the abolishment of the State’s control. The State would no longer be obliged to control imports and exports, because the equilibrium between imports and exports would be achieved by natural forces. Therefore, the equilibrium would occur naturally and automatically.

Nadharia hii inapingana na Uislamu, kwa sababu biashara ya nje ni mojawapo ya mahusiano kati ya Dola na mataifa, watu na mataifa mengine. Mahusiano haya yote yanadhibitiwa na Dola, na ni Dola inayoyapanga na kuyasimamia moja kwa moja, iwe ni mahusiano kati ya watu binafsi, au mahusiano ya kiuchumi au ya kibiashara. Kwa hiyo, itakuwa ni makosa kabisa kuikubali nadharia ya biashara huria, kwani Dola ya Kiislamu ingezuia usafirishaji wa bidhaa fulani huku ikiruhusu zingine. Pia ingeshughulikia suala la wafanyabiashara wanaopigana vita na wale walio na mikataba, ingawa ingewasimamia raia wake katika biashara yao ya nje kwa njia ile ile kama katika biashara yao ya ndani.