Excerpt: [I]'m convinced that Social Security privatization is not merely a bad idea but a certain failure, and I offered to provide a logical proof, challenging supporters to find the flaw or give up. My argument, as condensed as possible, defines success as bringing in more money than the current system does. More money is necessary either to reduce the gap between projected benefits and revenue or to make retirees better off. Supporters variously promise both of these benefits.