French economist Frederic Bastiat (1801-1850) explained, "There is only one difference between a bad economist and a good one: the bad economist confines himself to the visible effect; the good economist takes into account both the effect that can be seen and those effects that must be foreseen."
Bastiat elaborated further in his "Broken Window Fallacy" parable where a vandal smashes a shopkeeper's window. A crowd forms, sympathizing with the shopkeeper. Soon, someone in the crowd suggests that instead of a tragedy, there might be a silver lining. Instead of the boy being a vandal, he was a public benefactor, creating economic benefits for everyone in town. Fixing the broken window creates employment for the glazier, who will then buy bread and benefit the baker, who will then buy shoes and benefit the cobbler and so forth.
Bastiat says that's what's seen. What is not seen is what the shopkeeper would have done with the money had his window not been smashed. He might have purchased a suit from the tailor. Therefore, an act that created a job for the glazier destroyed a job for the tailor. On top of that, had the property destruction not occurred, the shopkeeper would have had a suit and a window. Now he has just a window and as a result, he is poorer.
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