This is one of the best books on money I have ever read. The authors do explain how international trade works, interest rates, etc. and relate all that to the movements of the FOREX ( Foreign Currency Exchange) markets.

I have struggled to achieve some degree of financial literacy ( from no background at all, other than a checking account and a few CD's). This book explains things clearly, and has filled in a lot of gaps about how the world of money works. But, it's not about how to place a trade in the FX markets and get rich quick. But, if you want to develop a sound FX trading plan, I would suggest making this book the first one you read.

I think it is probably useful for just about any kind of investor though, as currency exchange rates affect so many aspects of our financial lives, and we have truly become a global economy.