SimCity as inspiration for tax reform?

Herman Cain 999 Plan: Did It Come From SimCity? :

Long before Cain was running for president and getting attention for his 999 plan, the residents of SimCity 4 — which was released in 2003 — were living under a system where the default tax rate was 9 percent for commercial taxes, 9 percent for industrial taxes and 9 percent for residential taxes. (That is, of course, if you didn’t use the cheat codes to get unlimited money and avoid taxes altogether.)

(Via Huffington Post)