There seems to be this assumption that having a big ca deficit will lead to a sudden crash in an economy. It won't. In fact, a country can continue to have economic growth even with this deficit.
The problem comes with relative growth. The amount of growth that the US/UK/other EU countries will have will be slower than countries who have a ca surplus. Thus we will be relatively poorer. It doesn't mean that standards of living will decrease, just not increase as rapidly as other countries.
When you borrow money, you sign a contract, and you give the money back gradually, over a long period of time, with interest. The people your borrowing the money from doesn't suddenly ask for all the money in one hit. It's like getting a mortgage and then the bank suddenly demanding it all back.
The people you're borrowing the money from don't want it all back straight away because they know that they'll make more money in the long through the interest. The people borrowing the money don't pay it back straight away because they're happy with the short-term benefits of the money.
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A good example of this would be trying to build an extension onto your house.
- The extension will cost you £15,000.
- You can afford to save £300 per month.
- This will mean that it will take you ~4 years to save up for the extension.
- A bank approaches you offering to lend you £15,000 now, and you only have to pay £150 a month for the next 10 years.
- Great! Instead of having to wait for 4 years to get your extension, you can have it done now. What's more, you'll only have to cut £150 off of your monthly spending.
However, this means that you have to pay an extra £3,000 over the years. You've sacrificed £3,000 which you could have spent on an extra holiday in the long term, for a short term benefit.
Your standard of living hasn't dropped, it's stayed the same. However, your neighbour also did the same thing, except he saved the money himself. Sure, he didn't get his conservatory for 4 years, but when he did get it, he had caught up with you, and then he was also able to pay for that holiday, meaning that his standard of living has surpassed yours.