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Including the region where you live in your investment portfolio?
The problem is aggregating information from so many sources, countries, and economies.  You are probably more aware of local laws, local tax changes, local economic performance, etc, so it makes sense that you'd be more in tune with your own country.  If your intent is to be fully diversified, then buy a total world fund. A lot of hedge funds do what you are suggesting, but I think it requires either some serious math or some serious research. Note: I'm invested in emerging markets (EEM) for exactly the reason you suggest... diversification.