Because of the consumer base. Our demand exceeds our internal production so we bring it in from outside. China and India, for example, have far more people, but their average consumer spends a microscopic fraction of what US citizens do. A trade deficit isn't necessarily bad if it is because you have a strong consumer base. It makes the world dependent on you.
“A trade deficit isn’t necessarily bad if it is because you have a strong consumer base. It makes the world dependent on you. “
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Only until your money is gone...
See also: Gold Diggers.