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Darwin's Wedges abound in free markets, creating openings for profitable “price errors.” For example, polluting manufacturers have incentives to not pay for cleanup. The excluded costs create errors in price signals. And dispersed self-interest complicates voluntary fixes. Both sellers and buyers “benefit” when externalized costs yield lower prices. The seeming self-interest of market participants differs from society’s. Such divergences aren’t minor imperfections that we can safely ignore. - http://bigthink.com/errors-we-live-by/what-if-the-price-was-never-right