美国之所以能在三十多年的时间里年年保持贸易赤字，是因为外国人愿意把钱借给美国人为其净购买融资，方式是购买美国债券和股票或者投资美国房地产和其他企业。
The US has been able to sustain a trade deficit every year for more than three decades because foreigners are willing to lend it the money to finance its net purchases, by purchasing US bonds and stocks or investing in US real estate and other businesses.