Not many investors have guaranteed floors on their stock portfolios.

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Sure Warren Buffett seems to keep making money but he has enough capital and clout to negotiate preferred stock deals to rescue distressed companies in exchange for no-lose deals that give him a 6% guaranteed return with the chance for upside in the stock, as he did with Bank of America (BAC) in August.

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Some workers could be automatically enrolled into mutual funds that are too conservative or too risky for their liking, or they could assume that their 401(ks) are another form of Social Security that will be guaranteed no matter what the return of the stock market.

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Even better, in-stock purchases you make on this day are guaranteed to arrive by Christmas Eve.

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According to a new article in the Financial Analysts Journal, stock-market reversals of 50% or more are virtually guaranteed every 100 years.

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Ford stockholders overwhelmingly sought to tender 1.0 billion shares, or just under half of the 2.1 billion outstanding shares, of common stock, including 240.5 million tendered by notices of guaranteed delivery.

FORBES: Magazine Article

That may initially seem hard to believe, since yields for U.S Treasuries and German bunds have dropped to what seem to be unattractive levels in recent months as volatile stock markets have driven investors to put their money where they are guaranteed not to lose it.

FORBES: Magazine Article