Four brokerage firms operate in the same small city as Jackson’s firm. All the firms charge approximately the same listing commission and pay approximately the same cooperating commission to the selling broker. The commission splits within each firm are also similar. Is this an antitrust violation? Why or why not?

Yes, this is antitrust violation. Because, the tend to restrain trade in that small city thereby denying other small player brokerage firms from making a living due to their monopolistic actions among themselves.

Explanation:

Antitrust laws are designed in-order to prohibit a number of business practices that restrain trade. Examples of illegal practices are price-fixing conspiracies, corporate mergers that are likely to cut back the competitive fervor of certain markets, and predatory acts designed to gain or hold on to monopoly power.

Violations of such laws attract sanctions and punishment from the regulatory body in-charge of protecting such.

because she sucked. : )

(but so does trump, don't @ me)

answer; a set of mutual funds with similar risk characteristics to your mutual fund;