Items sold by measurement or counting
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If the item that is being exchanged is different from the other item, e.g. guavas are exchanged for oranges, wheat is exchanged for guavas or a fine fabric is exchanged for a coarse fabric, this will be permissible under all circumstances. It is not waajib for both the items to be equal nor is it waajib to execute the transaction there and then (i.e. it is permissible to take, for example, the guavas now and give the oranges later on).
Items sold by measurement or counting