Earlier quoted context omitted.
Poor aesthetics cause psychological harm through both distraction and pure ugliness. I shouldn't have to combat decades of scientific research on attention-stealing simply to maintain my train of thought as I walk down the street.
Admit it - you have no evidence other than anecdotes to prove that signs cause material harm, and therefore externalities. This is government red tape that hurts the economy in that city.
Could you then show some evidence for the below quote? -
> Basically, the economy in that city is worse off overall as a result, and there are fewer jobs to go around.