What antitrust action is illustrated when brokerages agree not to show homes listed by a new discount broker?

The situation described, where brokerages agree not to show homes listed by a new discount broker, exemplifies group boycotting. This practice occurs when a group of competitors conspires to exclude or retaliate against a particular entity—in this case, a discount broker—from participating in the market.

By not showing homes listed by the discount broker, the existing brokerages aim to undermine the new broker's ability to operate successfully, thereby protecting their own interests and preventing competition. This behavior is detrimental to market fairness and competition, as it limits consumer choice and keeps prices higher than they might be with a variety of brokers serving the market.

Group boycotting can lead to serious antitrust violations, as it not only restricts competition but also can manipulate market conditions to the benefit of the colluding parties. Understanding this concept is crucial in the realm of real estate and antitrust regulations, as it highlights the importance of fair competition for the benefit of consumers and the overall health of the market.