Here is what Warren Buffett, the world's greatest investor, had to say:“We think diversification, as practiced generally, makes very little sense for anyone who knows what they're doing. Diversification serves as protection against ignorance. If you want to make sure that nothing bad happens to you relative to the market, you should own everything. There's nothing wrong with that. It's a perfectly sound approach for somebody who doesn't know how to analyze businesses.But if you know how to value businesses, it's crazy to own 50 stocks or 40 stocks or 30 stocks, probably because there aren't that many wonderful businesses understandable to a single human being in all likelihood. To forego buying more of some super-wonderful business and instead put your money into #30 or #35 on your list of attractiveness just strikes Charlie and me as madness.”1996 Berkshire Hathaway Annual Meetinghttp://www.geocities.com/sandman_kmr3/Buffett_and_Investing.html“Another situation requiring wide diversification occurs when an investor who does not understand the economics of specific businesses nevertheless believes it in his interest to be a long-term owner of American industry. That investor should both own a large number of equities and space out his purchases…On the other hand, if you are a know-something investor, able to understand business economics and to find five to ten sensibly-priced companies that possess important long-term competitive advantages, conventional diversification makes no sense for you. It is apt simply to hurt your results and increase your risk. I cannot understand why an investor of that sort elects to put money into a business that is his 20th favorite rather than simply adding that money to his top choices - the businesses he understands best and that present the least risk, along with the greatest profit potential. In the words of the prophet Mae West: 'Too much of a good thing can be wonderful.'”1993 Letter to Berkshire Hathaway shareholdershttp://www.berkshirehathaway.com/letters/1993.htmlYou might want to take Buffett's advice:“Most investors, both institutional and individual, will find that the best way to own common stocks is through an index fund that charges minimal fees. Those following this path are sure to beat the net results (after fees and expenses) delivered by the great majority of investment professionals.”1996 Letter to Berkshire Hathaway shareholdershttp://www.berkshirehathaway.com/letters/1996.htmlThe Vanguard Total Stock Market Index fund is a great choice.
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