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What is Seen and What is Unseen

Claude-Frédéric Bastiat was a french economist and writer. One of his most famous works, "What is Seen and What is Unseen", introduced the idea of opportunity cost, although it wouldn't get that name for more than sixty years. Below is a link to a version of that essay, courtesy of the Mises Institute 

What is Seen and what is Unseen

Broken Windows Fallacy