"Thousands of tired, nerve-shaken, over-civilized people are beginning
to find out that going to the mountains is going home; that wildness is a
necessity; and that mountain parks and reservations are useful not only as
 fountains of timber and irrigating rivers, but as fountains of life."  John Muir

  • Short Interest Index data and code from Rapach, Ringgenberg, and Zhou (2016)