For decades, authorities and experts have tried restricting excessive borrowing by private equity investors, since it’s been repeatedly shown that they leave lots of bankruptcies in their wake. And these abuses continue because private equity looting fee structures result in general partners making out handsomely whether or not the business does well. In 1987 (no typo), the Treasury proposed limiting the deduction of interest on highly leveraged transactions. That idea went by the wayside thanks to the 1987 crash. Other proposals to restrict debt levels have similarly not gone anywhere. Yet now an important ruling looks set to deliver where regulators and legislators have failed.