The diversification effect that comes from investing in countries with low cross-correlations can result in both an increase in return and a reduction in volatility at the total portfolio level over the long term.

FORBES: Why Global Diversification Still Makes Sense

Investors also need to be made aware of the benefits of diversification and of the effect on their portfolios of tax rules and regulations.

ECONOMIST: Buttonwood

Under these circumstances, diversification among such sources is but a stop-gap solution that can, at best, have a temporary effect on oil supply and, hence, on national security.

CENTERFORSECURITYPOLICY: The Open Fuel Standard