SFWL: In the original (1900) "Wizard of Oz" BOOK --- upon which that (1939) MOVIE was later based --- the "Yellow Brick Road" was a symbol for the then "GOLD STANDARD", which backed the US Dollar. That whole movie represented the conflicting 'Political' agendas of that time, amongst the then candidates running for US President!! The movie's "TIN MAN" represented the "SILVER STANDARD", which one candidate wanted to deploy as a REPLACEMENT of the traditional GOLD STANDARD. And on, and on, and on, throughout that entire purported "CHILDRENS" book & later movie. GO-FIGURE!!
PS: The "Wizard" symbolized President William McKinley, who was assassinated, and supplanted by then (1900'ish) Vice Pres., Teddy Roosevelt.