L. Frank Baum's Allegory of Free Silver

Hugh Rockoff analyzes The Wizard of Oz as an allegory over the debate over free silver in this piece for the Journal of Political Economy (vol. 98, pp. 739-760), published in August of 1990. Here's a link, courtesy of JSTOR.

Full citation:

Hugh Rockoff, The "Wizard of Oz" as a Monetary Allegory, 98 Journal of Political Economy 739 (August 1990). 

Stable URL: http://www.jstor.org/stable/2937766