A negative externalit},r {additionally called "outer expense" or \"outside diseconomv") is a monetary action that forces an adverse consequence on an irrelevant outsider. It can emerge either during the creation or the utilization of a decent or service.[19] Pollution is named an externalitv since it forces costs on individuals who are "outer" to the maker and buyer of the dirtving product+[20] Ba rry Commoner remarked on the expenses of externalities