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In 'The Wizard of Oz', do you know why Dorothy's shoes were red? Or how many Oscars the film won?

As 'The Wizard of Oz' turns 75, here are some things you may not have known:

It is well known in economics academia that The Wonderful Wizard of Oz written by L. Frank Baum in 1900 is loaded with powerful symbols of monetary reform which were the core of the Populist movement and the 1896 and 1900 president bid of Democrat William Jennings Bryan.