@ sSafari File Edit View History Bookmarks Window Help 3 & ThuMar 28 5:26PM ng.cengage.com 2% MindTap - Cengage Learning & pashboard BN Y .: CENGAGE [ MINDTAP Q Search this course Module Four Quiz @ X Sidewalks grant many external benefits on society: increased pedestrian safety, and so on. Therefore, the market equilibrium quantity of sidewalks does not equal the socially optimal quantity. The following graph plots the demand for sidewalks (their private value), the supply of sidewalks (the PROFILE private cost of producing them), and the social value of sidewalks, including both the private value and external benefits. ORDERS Use the black point (plus symbol) to indicate the market equilibrium quantity. Next, use the purple point (diamond symbol) to indicate the socially optimal quantity. RENTALS (?) COURSES v Supply (Private Cost) nef Study tools Market Equilibrium @ College Success Tips Socially Optimal Level Career Success Tips PRICE OF SIDEWALKS Help R Demand ' I:-' SIGN OUT (Private Value) QUANTITY OF SIDEWALKS Social Value