Draw me a graph base on this description:

For an outright ban on plastic bags to be efficient, the social costs of plastic bag use must significantly exceed the private benefits. This condition can be illustrated using an economic graph that compares marginal social costs (MSC) and marginal private costs (MPC).

In this scenario, the MSC curve lies above the MPC curve, indicating that each additional plastic bag used imposes a higher cost on society than the benefit received by consumers. The area between the MSC and MPC curves represents the external costs not accounted for by the market. An outright ban is efficient if these external costs are substantial, making the net social benefit of the ban positive.