If a negative externality exists, then there is a __________ when society produces the market output instead of the socially optimal output. This exists because the __________ to sellers and third parties are __________ the __________ derived by buyers. Group of answer choices net social benefit; costs; greater than; benefits net social cost; benefits; less than; costs net social cost; costs; greater than; benefits net social cost; costs; less than; benefits none of the above