This is not permissible as the original seller should agree with them on a percentage or a fixed amount when the transaction takes place. If he knew how much profit they were making, he would not have approved it in the first place.

Here in India land BROKERS follow one technique. They make an arrangement with land owner. The contract format is like, the broker pay the owner (for example)10 million but he will sell to higher price according to his marketing skills. Brokers pay an advance of nominal amount and sell it to 3rd party with higher profit. Here the land owner gets lower amount and does not know the real market value. Is this allowed?

Islamic economy | November 15, 2014 5:46 pm
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If someone distribute souveniors and or gift items such as wallets, pens, usb keychains, etc with his company name embosed on them in order to promote his business with clear intention of getting business, does it fall into the category of rishwat (bribe)?
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Can we avail discount offered to customers when buying things in such a way that they get either points or VOUCHERS for shopping and on their 3rd or 4th shopping they get 10% or £15 off. The store sell alcohol, movies and non Halal meat apart from Halal meat section, grocery, electronics, medicines and someone shops only permitted products in Islam.