High certain social expenses, as negligible harms, lead to an over-creation. In the graph, there is overproduction at QMarket - Qoptimum with a related extra weight loss of the concealed triangle. One of the public area solutions for disguising externalities is a restorative duty. As per neoclassical financial specialist Arthur Pigou,[6] to address this market disappointment (or externality) the public authority should demand an assessment which equivalents to peripheral harms per unit. This would really build the company's private minimal with the goal that SMC = PMC.[3]