Investors should take another look at their asset allocations to account for new risks in the global economy, according to Chris Philips, senior analyst for Vanguard's investment strategy group. Concerns about the euro and the aftereffects of Japan's nuclear crisis are among the factors contributing to uncertainty in the market. Vanguard recommends that clients hold up to 30% of their portfolios in international investments with an eye on diversification, Philips says.

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