David Barstow's explosive 7,600-word investigation of corruption at Wal-Mart is required reading this weekend. I'm not going to attempt to summarize the whole thing, but basically Eduardo Castro-Wright, currently Wal-Mart's vice-chairman, oversaw a culture of bribery when he was CEO of Walmex. And when a key player in that bribery scheme blew the whistle, Walmart in Bentonville buried the investigation, and didn't report anything to the authorities in either Mexico or the US.