What explains the US net income balance?

Despite a significant deterioration in the US net foreign asset position, there has not been a corresponding deterioration in the net income balance. In fact, there has generally been a net income surplus. Two factors have been particularly important for the positive net income balance over the past 15 years or so. The first is that the United States has a positive net external equity balance and a negative net external debt balance. This contributes to a net income surplus because the income yield on equity has been higher than the income yield on debt.