How similar is Cain's plan to SimCity 4?'Almost exactly the same,' says Nate Jones in Metro New York. Your fake city's default across-the-board tax rate is, of course, 9 percent. 'But it'd be even bolder if SimCity hadn't come up with the idea eight years ago.' As Amanda Terkel at The Huffington Post noticed, the new GOP frontrunner's proposal - flat 9 percent corporate, income, and national sales taxes - should be familiar to anyone who's played SimCity 4, a 2003 computer game where you are 'mayor' of a simulated city. Former Godfather's Pizza CEO Herman Cain 'has jumped to the top of Republican polls thanks to a bold tax scheme called the '9-9-9 Plan,'' says Jared Newman in TIME.