Exactly how long should a buy-n-hold investor “hold?” For example, if you held the Dow Jones Industrials Average from 1916 through 1981, would you have made money in those 65 years? Not from inflation-adjusted price appreciation.

Both the media and a wide array of financial advisers preach owning a diversified portfolio.

Out of the twelve fund styles I detailed in my Style Rankings for ETFs and Mutual Funds report, the Small Cap Value style ranks last. It gets my Dangerous rating. Here's why...