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If electricity producers create a negative externality equal to $$67\mathrm{.}50$ per unit, then we can correctly conclude that

Select one:

a$.$ the equilibrium quantity is less than the socially optimal quantity.

b$.$ the equilibrium quantity is equal to socially optimal quantity.

c$.$ the equilibrium quantity is greater than the socially optimal quantity.

d$.$ imposing a $$67\mathrm{.}50$ Pigouvian tax on electricity producers would decrease the total surplus.

e$.($c$)$ and $($d$).$