This column highlights the most interesting and useful business and financial commentary from around the Web each day. Feel free to send along your own suggestions for blog content that you've read or written.   Economix Link: The Koch Brothers the Cato Institute and Why Nations Fail  "A dispute has broken out between the Cato Institute a leading libertarian think tank and two of its longtime backers — David and Charles Koch. The institute is not the usual form of nonprofit but actually a company with shares; the Koch brothers own two of the four shares and are arguing that they have the right to acquire ...