Find out how underwear sales, snow totals and more are used to predict the direction of the stock markets.
Billboard Top 100 Indicator -- The newest indicator on this list suggests that songs "high in beat variance" are popular when market volatility is low. When volatility is high, people tend to prefer songs that have a more consistent beat.
Lucy Richardson/ Reuters
iStock / gbh007
National Portrait Gallery, London
iStock / mashabuba
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