Which of the following is not a good example of economies of scale?

Group of answer choices

A small electric power plant provides more flexibility than larger plants.

National banks like Bank of America can afford a fully$-$staffed compliance department, while small community banks can$$t$.$

Large retailers like Walmart can afford an in$-$house counsel by spreading the cost over a large volume of business, while a small convenience store in your neighborhood can$$t$.$

Large power plants produce electricity at much lower cost than a small plant.