That is correct. Some require exclusive listings and others do not. When I was looking to sell a contract, I had the same one listed with 3 different brokers. If one broker makes a sell and you fail to notify the other brokers, you may be liable if they receive a full price offer for the profit they would have made on a sale. Point is, if you list with multiple brokers, as soon as you accept an offer, notify other brokers. We ended up keeping our contract because it is our largest and is exempt from the new resale restrictions implemented this year.