He was also asked:
About goods sold under exclusive concessions in shops, such as sesame oil and other foodstuffs, as well as non-food items. This arrangement involves someone undertaking to sell a particular commodity exclusively, on condition that no one else sells any of it. He says to the owner of a shop, caravanserai, or other premises:
“I undertake to pay you such-and-such an amount each month, on condition that I buy and sell here a commodity that no one else may sell, or carry out such-and-such work”—specifying a particular activity—“on condition that no one else may do the same.”
Is it permissible to buy these goods from this person when one can obtain goods of the same kind elsewhere? Is it permissible to use these very goods because obtaining alternatives entails hardship, whether or not necessity requires their use?
He replied:
Praise be to Allah. If one has no need to buy from him, one should refrain from doing so, for he acts unjustly by preventing others from selling. Even if there were nothing doubtful about his wealth, it would still be preferable to avoid dealings with him and shun him as far as possible.
[As for buying from him—especially when there is a need—it is not judged unlawful] (*). Nor