I’ve not heard this one before:
http://news.bbc.co.uk/2/hi/uk_news/magazine/7933175.stm
Snippets:
Baum published the book in 1900, just after the US emerged from a period of deflation and depression. Prices had fallen by about 22% over the previous 16 years, causing huge debt.
Farmers were among those badly affected, and the Populist political party was set up to represent their interests and those of industrial labourers.
The US was then operating on the gold standard - a monetary system which valued the dollar according to the quantity of gold. The Populists wanted silver, along with gold, to be used for money. This would have increased the US money supply, raised price levels and reduced farmers’ debt burdens.
…
SYMBOLISM OF CHARACTERS
Dorothy: Everyman American
Scarecrow: Farmer
Tin Woodman: Industrial worker
Lion: William Jennings Bryan, politician who backed silver cause
Wizard of Oz: US presidents of late 19th Century
Wicked Witch: A malign Nature, destroyed by the farmers’ most precious commodity, water. Or simply the American West
Winged Monkeys: Native Americans or Chinese railroad workers, exploited by West
Oz: An abbreviation of ‘ounce’ or, as Baum claimed, taken from the O-Z of a filing cabinet?
Emerald City: Greenback paper money, exposed as fraud
Munchkins: Ordinary citizens