BusinessWeek has just published an article about Bank of America’s recent surprise mailings in January to some of its customers, announcing “that it would more than double their rates to as high as 28%, without giving an explanation for the increase.” These customers have good credit scores and hadn’t made any late payments, and those who called Bank of America to ask why this was happening weren’t given clear reasons. Industry experts say Bank of America has reached a “new level” of “lack of transparency in raising rates,” beyond anything Citigroup and JP Morgan Chase currently practice, because BoA is apparently using some undisclosed internal metric to determine who gets the rate hike.