Investors of any age who are concerned about diversification but who lack the means to invest in multiple funds simultaneously can always turn to target-date funds, most of which are "funds of funds" that include a blend of domestic and foreign equities, as well as fixed-income holdings.

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Then you have the turn-based titles, which have multiple sub-genres as well.

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That, in turn, could damage the price-earnings multiple that investors are willing to pay for their shares, raising banks' cost of capital.

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Better to turn to enterprise multiple enterprise value divided by 12-month trailing operating profits (earnings before interest, taxes, depreciation and amortization).

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