Does an investment boom in one country raise interest rates abroad?
Core argument: Because investors can buy bonds across borders, an investment boom in the United States draws loanable funds from other nations and pushes their interest rates up as well.
Investors can buy bonds across borders, so an investment boom in the United States can draw in loanable funds from other nations and drive up their interest rates. The international linkage between interest rates isn’t always one-for-one. That’s mainly because investors deciding which nation’s bonds to buy don’t just look at interest rates -- they also take into account expected changes in exchange rates. For example, there was a sharp rise in U.S. interest rates in the early 1980s that was only partially matched by a rise in German rates. The reason was that this was also a period of an extremely strong dollar, which many investors believed (correctly) would prove temporary. So German investors buying U.S. bonds had to set the high interest rates they could earn against the capital losses they were likely to experience when the dollar came back to earth.

