Which of the following is NOT a responsibility of the FTC?

The Federal Trade Commission (FTC) has a specific mandate focused on protecting consumers and ensuring a fair competitive marketplace. This includes responsibilities like conducting investigations of business practices to identify any unfair or deceptive actions, publishing the findings of those investigations to inform the public and businesses, and holding trial-like hearings on trade disputes to enforce compliance with trade regulations.

Setting corporate taxes, however, does not fall within the FTC's jurisdiction. Taxation matters are typically governed by the Internal Revenue Service (IRS) and related governmental bodies. The FTC's role is centered around consumer protection and antitrust law rather than fiscal policy or tax regulation, which makes the answer identifying the responsibility not relevant to the FTC correct.