In: Economics
In the graph above, we see the horizontal line of PMB (price) as the bee keeper is willing to sell any quantity at a fixed price. As the neighbors benefit from the bee keeping acitvity, social benefit is greater than personal benefit. So, SMB curve (Social marginal benefit curve) is higher than PMB (private marginal benefit) curve. As a result of this equation, the equilibrium point of social benefit is higher than the original equilibrium point of private benefit. Thus socially optimal quantity Q1 is greater than the private optimal quantity, Q.
Thus, pareto efficient quantity is Q1 while the quantity chosen by the bee keeper is Q.
Pareto efficiency: Pareto efficiency can be defined as a situation where no individual or party can be made better off without making atleast one individual or party worse off.
In positive externality, the private economy lacks incentives to create an outcome that is beneficial to the larger society; therefore resulting in losses in Pareto efficiency. Therefore, government intervention is required to motivate individuals like the bee keeper to produce a socially optimal output so that the other individuals can benefit from bee keeping without making anyone worse off. Thus the Parto efficient Q1 output can be produced.