The 1939 film is the most famous evocation of the story
Dorothy in Kansas conjures up nostalgic thoughts of childhood Christmases hiding behind the sofa from the Wicked Witch of the West. Or those flying monkeys.
It's unlikely its young fans will have been thinking about deflation and monetary policy.
But the story has underlying economic and political references that make it a popular tool for teaching university and high school students - mainly in the United States but also in the UK - about the economic depression of the late 19th Century.
At a time when some economists fear an onset of deflation, and economic certainties melt away like a drenched wicked witch, what can be learnt from Oz?
The 1939 film starring a young Judy Garland was based on Lyman Frank Baum's book, The Wonderful Wizard of Oz, published in 1900. It told of an orphaned Kansas girl swept by a tornado into a fantastical world, but who wants to return home to her aunt and uncle.
Thinking the great Wizard of Oz can grant her wish, she sets out to meet him with her beloved dog, Toto, joined by a scarecrow, a tin woodman and a lion.
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.
Comment: Although there are other meaningful interpretations, this one is rather timely.