The first is the controversy over the role of Bain Capital, the investment partnership whose founders included Republican presidential hopeful Mitt Romney. The second is the disclosure by another firm, The Carlyle Group, of how its top executives are compensated.

Carlyle disclosed its executive compensation in some detail, providing a rare glimpse into how investment firm managers are paid. Combined with the Bain flap, it will surely reopen the five-year old debate over the special tax treatment these partnerships receive through a mechanism known as carried interest or, in short, “the carry.”

Carlyle’s disclosure opens a small window into how this works. In 2011, its three founders were each paid about $140 million. But they received just $275,000 in salary and another $3.5 million in the form of a bonus (also taxable at ordinary income rates). But each also got $134 million—or 96 percent of their compensation–from investment profits. Much came from the carry and is taxable at 15 percent.