Both types of agents have the same true marginal benefits equal to the line labeled True MB. However, the myopic agents misperceive their benefits and demand too little of the good. Their MB curve is shifted down vertically by $9. The good is sold in a competitive market with a constant marginal cost of production equal to $22. There is also a constant positive externality per unit produced equal to $12. The corresponding social marginal cost curve is drawn. Assume that there are an equal number of myopic and rational agents so that each MB curve represents the same amount of agent. Note that the socially optimal quantity to be consumed by both myopic and rational agents is the same, and it is equal