From Wikipedia article titled "Externality":
There are a number of potential means of improving overall social utility when externalities are involved. The market-driven approach to correcting externalities is to "internalize" third party costs and benefits, for example, by requiring a polluter to repair any damage caused. But, in many cases internalizing costs or benefits is not feasible, especially if the true monetary values cannot be determined.
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Only the private sector can create both positive and negative externalities.
expedite the the quality of service transportation and add the speed of transport. maybe this link is helpful to you http://www.econlib.org/library/ENC/PublicGoodsandExternalities.html
Negative * positive = negative Positive * positive = positive Negative * negative = positive
No, a negative plus a negative is a negative