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Likewise, it is logical to borrow to hold a risk-free asset and increase your portfolio returns, but finding a truly risk-free asset is another matter. Government-backed bonds are presumed to be risk free, but, in reality, they are not. Securities such as gilts and U.S. Treasury bonds are free of default risk, but expectations of higher inflation and interest rate changes can both affect their value.

Then there is the question of the number of stocks required for diversification. How many is enough? Investment guru William J. Bernstein says that even 100 stocks is not enough to diversify away unsystematic risk. By contrast, Edwin J. Elton and Martin J. Gruber, in their book

«MPT and Investment Analysis», conclude that you would come very close to achieving optimal diversity after adding the twentieth stock.

Conclusion

The gist of MPT is that the market is hard to beat and that the people who beat the market are those who take above-average risk. It is also implied that these risk takers will get their comeuppance when markets turn down.

Then again, investors such as Warren Buffett remind us that portfolio theory is just that – theory. At the end of the day, a portfolio’s success rests on the investor’s skills and the time he or she devotes to it.

Source: March 14, 2006; By Ben McClure, investopedia

Warren Buffett: How He Does It

Did you know that a $10,000 investment in Berkshire Hathaway in 1965, the year Warren Buffett took control of it, would grow to be worth nearly $30 million by 2005? By comparison, $10,000 in the S&P 500 would have grown to only about $500,000. Whether you like him or not, Buffett’s investment strategy is arguably the most successful ever. With a sustained compound return this high for this long, it’s no wonder Buffett’s legend has swelled to mythical proportions. But how did he do it?

Buffett’s Philosophy

Warren Buffett descends from the Benjamin Graham school of value investing. Value investors look for securities with prices that are unjustifiably low based on their intrinsic worth. Determining intrinsic value can be a bit tricky as there is no universally accepted way to obtain this figure. Most often intrinsic worth is estimated by analyzing a company’s fundamentals. Like bargain hunters, value investors seek products that are beneficial and of high quality but underpriced.

Warren Buffett takes this value investing approach to another level. Many value investors aren’t supporters of the efficient market hypothesis, but they do trust that the market will eventually start to favor those quality stocks that were undervalued. Buffett doesn’t think in these terms. He isn’t concerned with the activities of the stock market.

He chooses stocks solely on the basis of their overall potential as a company. Holding these stocks as a long-term play, Buffett seeks not capital gain but ownership in quality companies extremely capable of generating earnings. When Buffett invests in a company, he isn’t concerned with whether the market will eventually recognize its worth; he is concerned with how well that company can make money as a business.

Buffett’s Methodology

Buffett finds low-priced value by asking himself some questions when he evaluates the relationship between a stock’s level of excellence and its price.

1. Has the company consistently performed well?

Sometimes return on equity is referred to as

«stockholder’s return on investment». It reveals the rate at which shareholders are earning income on their shares. Buffett always looks at ROE to see whether or not a company has consistently performed well in comparison to other companies in the same industry.

Looking at the ROE in just the last year isn’t enough. The investor should view the ROE from the past five to 10 years to get a good idea of historical performance.

2. Has the company avoided excess debt?

Gearing is another key characteristic Buffett considers carefully. Buffett prefers to see a small amount of debt so that earnings growth is being generated from shareholders’ equity as opposed to borrowed money. Debt to equity ratio shows the proportion of equity and debt the company is using to finance its assets, and the higher the ratio, the more debt is financing the company. A high level of debt compared to equity can result in volatile earnings and large interest expenses.

3. Are profit margins high? Are they increasing?

The profitability of a company depends not only on having a good profit margin but also on consistently increasing this profit margin. This margin is calculated by dividing net income by net sales. To get a good indication of historical profit margins, investors should look back at least five years. A high profit margin indicates the company is executing its business well, but increasing margins means management has been extremely efficient and successful at controlling expenses.

4. How long has the company been public?

Buffett typically considers only companies that have been around for at least 10 years. As a result, most of the technology companies that have had their IPOs in the past decade wouldn’t get on Buffett’s radar (not to mention the fact that Buffett will invest only in a business that he fully understands, and he admittedly does not understand what a lot of today’s technology companies actually do). It makes sense that one of Buffet’s criteria is longevity: value investing means looking at companies that have stood the test of time but are currently undervalued.

Never underestimate the value of historical performance, which demonstrates the company’s ability (or inability) to increase shareholder value. Do keep in mind that the past performance of a stock does not guarantee future performance – the job of the value investor is to determine how well the company can perform, as well as it did in the past. Determining this is tricky, but evidently Buffett is very good at it.

5. Do the company’s products rely on a commodity?

Initially you might think of this question as a radical approach to narrowing down a company. Buffett, however, sees this question as an important one. He tends to shy away from companies whose products are indistinguishable from those of competitors, and those that rely solely on a commodity such as oil and gas. If the company does not offer anything different than another firm within the same industry, Buffett sees little that sets the company apart. Any characteristic that is hard to replicate is what Buffett calls a company’s economic moat, or competitive advantage. The wider the moat, the tougher it is for a competitor to gain market share.

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