The McKinsey Global Institute looks at the growth in one corner of the global debt market: corporate debt. The total debt of nonfinancial corporations, including bonds and loans, has more than doubled over the past decade, growing by $37 trillion to reach $66 trillion in mid-2017, or 92 percent of global GDP. This growth is nearly equal to the increase in government debt, which has received far more attention. In a departure from the past, a large share of the growth in corporate debt has come from developing countries, and in particular China, which now has one of the highest ratios of corporate debt relative to GDP in the world.