Dominant firm facing residual demand: Pd above Pt, Qd below Qt Dt So St Dd MRd MCd Quantity Price Qt Pt Qd Pd At Q≈4.7, MRd = MCd ≈ 3.3. This is the profit-maximizing output. Pd ≈ 5.0 sits above Pt ≈ 4.3. Total output is now below Qt.