This section is from the book "American Law Of Real Estate Agency", by William Slee Walker. Also available from Amazon: American law of real estate agency.
Where M., who was to receive a commission for a sale of B.'s land, turned over the sale of the land to L., agreeing that L. should have the commissions therefor, to which B. consented before a sale was made, L., on selling the land, was not entitled to a commission as the assignee of M., but because he, with the knowledge and consent of B., sold the land after M. had waived his right to do so. Munson v. Mabon, 135 Iowa, 335, 112 N. W. 775.
 
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