Using a series of weighted indicators, we try to predict Arab countries' vulnerability to revolution Arab spring Subscribe NOW to The Economist: econ.st/1Fsu2Vj Get more The Economist Follow us: twitter.com/TheEconomist Like us: www.facebook.com/TheEconomist View photos: instagram.com/theeconomist/ The Economist videos give authoritative insight and opinion on international news, politics, business, finance, science, technology and the connections between them.