经常账户赤字相当于贸易赤字加上维持国际资产净值地位的费用：即所欠的在美国投入资本的外国人的净租金、利息和股息。
The current-account deficit is equal to the trade deficit plus the cost of servicing the net international asset position: the net rent, interest, and dividends owed to foreigners who have invested their capital in the US.