If a union of brokers in New York State bound together and agreed to only accept commissions of 9% what may be held liable for is: Price fixing.
Price fixing can be defined as the process in which market competitors decide to enter into an agreement concerning a market price by fixing a particular price on a product.
Based on the given scenario the union of brokers are making use of price fixing because they both agreed to accept a commission of 9% or higher.
Inconclusion what may be held liable for is: Price fixing.
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