According to Section 20 of the Indian Partnership Act, 1932, the partners in a firm may, by contract between the partners, extend or restrict implied authority of any partners. \nNotwithstanding any such restriction, any act done by a partner on behalf of the firm which falls within his implied authority binds the firm, unless the person with whom he is dealing knows of the restriction or does not know or believe that partner to be a partner. \nThe implied authority of a partner may be extended or restricted by contract between the partners. Under the following conditions, the restrictions imposed on the implied authority of a partner by agreement shall be effective against a third party: \n1. The third party knows above the restrictions, and\n2. The third party does not know that he is dealing with a partner in a firm. \nNow, referring to the case given in the question, M supplied furniture to A, who ultimately sold them to a third party and M was also ignorant about the agreement entered into by the partners about the change in their role. M also is not aware that he is dealing with a partner in a firm. Therefore, M on the basis of knowledge of implied authority of A, can recover money from the firm. \nBut in the second situation, if M was having knowledge about the agreement, he cannot recover money from the firm.