The parable of the broken window was introduced by Frédéric Bastiat in his 1850 essay Ce qu'on voit et ce qu'on ne voit pas (That Which Is Seen and That Which Is Unseen) to illustrate why destruction, and the money spent to recover from destruction, is actually not a net-benefit to society. The parable, also known as the broken window fallacy or glazier's fallacy, demonstrates how opportunity costs, as well as the law of unintended consequences, affect economic activity in ways that are "unseen" or ignored. (Wikipedia)
http://www.youtube.com/watch?v=WsahaLhIcKs
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Yes, the unseen things do cost us indeed. What got you interested in Bastiat?
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Oh, just something I recall reading when I was in college years ago.