To lazy to actually learn something yourself?
Look here, this page describes the Sherman Act, Clayton Act and the Federal Trade Commission Act from which I derive my much oversimplified but accurate summation of organizations acting as a trust to prevent competition or employ anti competition monopolistic practices.
So instead of posting uninformed baseless challenges actually go learn something.
In short it is not legal to create a body dedicated to denying fair competition to a business group or community. It literally does not matter if there are other alternatives, it is still illegal to try to create anti competition, go look up the anti trust laws and stop looking so silly with your uninformed assumptions.
Bravo! I congratulate you for giving yourself a mini-tutorial on anti-trust law.
Unfortunately, in your research you seem to have gotten a confused understanding as to who is liable under the various Acts.
The laws pertain to COMPETITORS, not customers. If you live in a town with just two bakeries, you are under no obligation to balance your purchases at White Bread Inc. with purchases at La Baguette & Co., even if in not so doing your actions contribute to the failure of La Baguette. If, on the other hand, Amalgamated Big Bread, a huge producer, comes into town and undercuts both White Bread and La Baguette so as to drive them out of business, then yes, Amalgamated is liable for anti-competitive action.