“Trevor Davis, a former consumer products expert at IBM, came up with a theory that matched heel length with economic upturns. ‘The index worked by analysing social media and other online sources for influencer and consumer references to shoes and boots where there was either a specific height of heel mentioned, like ‘four inches’ or a phrase that could be equated easily to a height,’ he says. ‘We then correlated that with a variety of indicators of economic performance to get the index.’ He says the data revealed that when economic indicators turned down the heel height initially went up, but if the economy remained in a recession state for more than a few months then heel heights went down.”
— “Can the ‘high heel index’ predict economic growth?” Priya Elan, The Guardian
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