Aaron has been asked by Mariappan to negotiate a business deal on his behalf with Tune Sdn Bhd. Mariappan has reminded Aaron to close the deal legally with Tune Sdn Bhd before the end of March 2020. Aaron agreed. The deal had been successfully negotiated but Mariappan found that Aaron had used the illegal means of obtaining confidential profits through the negotiation. Mariappan argued on how Aaron dealt with Tune Sdn Bhd. Aaron emphasized that it was a common method used in business. Mariappan need not worry since his instruction to obtain the contract had been successfully completed.

Under the principle of agency, how is the business deal supposed to be conducted? Support your answer with legal provision from the Contract Act 1950 and ONE (1) relevant case.