Why Warren Buffett matters beyond Wall Street

OMAHA, Neb. — Raven Connelly flew from London. Katherine Schaaf took Amtrak from San Francisco. And Bill and Carol Thatcher drove several hours from Fort Dodge, Iowa — population 26,000.They were just a few of the tens of thousands of people who descended on Omaha last weekend to pay tribute to the billionaire investor Warren Buffett — and, it turned out, to witness his retirement announcement on Saturday.\"One of the great pleasures in this business is having people trust you,\" Buffett told his rapt audience during a lengthy Q&A, hours before announcing his retirement: \"Why [else] work at 90, when ..