Wizard of Oz also interpreted as a parable about populism and monetary systems.
"Since most of us don't walk around thinking about the social movements and political debates of the late 1800s, a quick refresher on populism is in order. Similar to parties on our political landscape today, the Populist movement was a rising third-party campaign of angry disenfranchised “plain people” (farmers and, to a smaller degree, factory workers) seeking to wrest power from bankers and business leaders. United under the banner of the People’s (Populist) Party, these men and women sought fundamental economic change in order to break the power of concentrated capital. Populists advocated for bimetallism (the coining of both gold and silver), nationalizing the railroads, a graduated income tax, and a decrease in immigration. They believed that adopting silver (in addition to the gold standard) would pump money into the economy, resulting in limited inflation—a good change for people paying mortgages, a bad one for the banks holding loans."
http:// americanhistory.si.edu/blog/populism-oz