The ruling on an agent taking the increase in price if he sells to the principal for more than what he wants

Question : Shaykh, if the agent says to his principal, “Buy this need for me for one hundred dinars,” and it is known that if he buys it for one hundred dinars, the agent who was appointed is pleased, and the principal who appointed the agent is pleased. Is it permissible for the agent to act in his own interest by buying it for less than one hundred and taking the remainder?

Answer : This is a form of betrayal, because some people may do this. He buys it for a price lower than what was set for him, or lower than the value of its equivalent, and then sells it to the principal for more. This is betrayal. So it is obligatory for him, if he wants to benefit, to say, “Appoint me to buy it for you for a consideration.” Then his conscience is cleared. Yes.