Rand's philosophy is not about economics - it's a complete system, with distinct metaphysical, epistemological and moral positions, all of which give rise to applications in politics, art, science and other fields of human endeavor. (Not unlike Aristotle.)
Here's the citation for Atlas Shrugged being only 2nd to the Bible in popularity: http://webcache.googleusercontent.com/search?q=cache:U54zOrN...
How do you know that comparing her to Aristotle is laughable if you don't actually know what she said?
I recommend "Introduction to Objectivist Epistemology" if you'd like to compare her epistemology with Aristotle's.
Edit: again, why the downvote? Yes, I know some people don't like Ayn Rand (and others adore her). But there's nothing in this message that warrants a downvote.