Consider second order effects of your actions

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Warren Buffett used a very apt metaphor once to describe how the second-order problem is best described by a crowd at a parade: Once a few people decide to stand on their tip-toes, everyone has to stand on their tip-toes. No one can see any better, but they’re all worse off.
Buffett, Warren.
“Letter to Shareholders, 1985.” BerkshireHathaway.com. Retrieved from: http://www.berkshirehathaway.com/letters/1985.html