A broker discussing raising commission rates can be found guilty of which violation?

When a broker discusses raising commission rates, this can lead to the violation known as price-fixing. Price-fixing occurs when two or more parties agree to set the price of a product or service, which in this case would involve brokers conspiring to increase their commission rates above what a competitive marketplace would typically dictate. This practice can restrict competition and raise costs for consumers, making it illegal under antitrust laws.

By engaging in such discussions, brokers may undermine the competitive nature of the real estate market, resulting in penalties and legal actions. Price-fixing is taken seriously by regulatory bodies because it can harm consumers by eliminating the benefits of competition, such as lower prices or better services. Thus, discussing raising commission rates in a collusive manner is a clear example of price-fixing, and that is why this is the correct answer.