The Wall Street Journal reports major conflicts between the DOJ and the FTC over antitrust jurisdiction. There are only two of them, and they are not subject to rules against collusion and open agreements. Nonetheless, they can’t get along and they cannot decide on market division. Maybe they will take this as information about difficulties of collusion, even in duopoly situations.
Dissention in antitrust agencies
Paul H. Rubin, Dissention in antitrust agencies, Truth on the Market (April 12, 2011), https://truthonthemarket.com/2011/04/12/dissention-inantitrust-agencies/