Common sense is not actually very common

IN 1776 THOMAS PAINE, a traitorous Englishman living in the American colonies, published a seditious 47-page pamphlet. Called “Common Sense”, it became a best-seller. It argued that the colonies should seek independence from British rule. Later that year they did exactly that.

Appeals to common sense are a staple of politics, especially when an insurgent wishes to distinguish himself from a supposedly aloof and out-of-touch elite. But in a paper published in Proceedings of the National Academy of Sciences, Mark Whiting and Duncan Watts, a pair of computational social scientists at the University of Pennsylvania, note that the idea has seldom been rigorously studied.