An agreement of the type contemplated in the OP (as I understand it) would very likely be treated as anticompetitive โper se,โ and therefore not require any empirical inquiry into the effects on the โmarketโ (however defined).
An agreement of the type contemplated in the OP (as I understand it) would very likely be treated as anticompetitive โper se,โ and therefore not require any empirical inquiry into the effects on the โmarketโ (however defined).