The market for a good with a negative consumption externality can be analyzed graphically. The demand curve represents the marginal private benefit (MPB), while the supply curve represents the marginal private cost (MPC), which is also the marginal social cost (MSC) in this case, assuming no production externality. The negative externality is represented by a separate marginal external cost (MEC) curve. The marginal social benefit (MSB) is the MPB minus the MEC. The market equilibrium occurs where MPB = MPC, resulting in an overconsumption of the good compared to the socially optimal level, which is where MSB = MSC. The area between the market quantity and the optimal quantity, bounded by the MSC and MSB curves, represents the deadweight loss to society.