This problem describes what is internaltional investing and why it takes place. It gives some relevant references.
What is international investing?
International investing has probably been around for centuries, and probably for thousands of years. This fact might be a bit surprising. International investing does not seem easy. International investors need to analyze assets from a huge number of asset classes (stocks, bonds, derivatives, etc.), and from different national markets and currencies. The number of individual securities to invest presents a big challenge for international investors. The challenge is not a valuation problem since the same techniques and models used to value a domestic asset are usually used to value a foreign asset. The challenge is a practical once: international investors have to reduce each investment to a tractable number of parameters; otherwise the resources spent on international investing would be too high. ...