Interest rates impact rising prices because they reduce how much extra money people have to spend. The order of events typically goes:
1. Central banks raise rates.
2. Loans, including mortgages, cost more, while savings accounts generate more interest.
3. People have less money to spend and are encouraged to save rather than spend.
4. Economic growth slows.
5. Prices go down as people spend less.
This broadly lays out what happened in the UK, which saw sluggish economic growth last year. But crucially, despite high inflation and interest rates, the US economy stayed remarkably resilient.
A key factor behind this difference comes from mortgages. In the UK, two and five-year mortgages are common, so lots of people had to renew at a higher rate last year. But in the US, you can lock in a mortgage for 30 years, so rising rates affected fewer homeowners.
The US job market stayed strong too, so people had jobs and money to spend.