Now, 12 years later, it’s happening again. This time, however, it’s not households using cheap debt to take cash out of their overvalued homes. Rather, it is giant corporations using cheap debt — and a one-time tax windfall — to take cash from their balance sheets and send it to shareholders in the form of increased dividends and, in particular, stock buybacks. As before, the cash-outs are helping to drive debt — corporate debt — to record levels.