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There are two main deficits -- trade and federal government. Here we are talking about the trade deficit. The recent news is the federal government deficit, which has a similar effect but different than the trade deficit.
When we get stuff from overseas but don't pay for it, someone has to underwrite that debt. When the U.S. government spends money it doesn't have, someone has to loan it to them. Nowadays, that is usually a foreign investor. That foreign investor gives a bank in the U.S. money, and expects to come back years later to collect that money, with interest. Also there are government bonds that give interest.
If the FED keeps interest rates too low, then the value of the dollar (and bonds) goes down because there are other countries where these foreign investors could make more interest by loaning money. So while the FED always states in the news that they raise the rate to prevent inflation, they also have to keep an eye on this.
A larger deficit (either one) means the country is more of a risk. If our economy tanks, or the dollar tanks, then those foreign investors will take a big wash. Raising the interest rate makes it more worth the risk. When the FED raises the rate, the credit card companies can't buy loans as cheap, so they pass this rate increase on to the credit card holders.
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