There are many reasons for investing abroad, but one of the main ones is diversification or, put another way, placing your eggs in several different baskets.
The theory behind geographical diversification is quite straightforward:
whereas
Spreading your investments between markets which rise and fall at different times (which are 'non-correlated', to use the jargon), should reduce your overall risk and boost your overall returns.
There are no guarantees, of course. You've got to choose the right markets, and the right investments in those markets, for diversification to work the way it's supposed to.
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