Seth Klarman’s extraordinary and mysterious book Margin of Safety, Risk Averse Investing Strategies for the Thoughtful Investor has sold for $700 for used varieties with newer copies going for $2,500 to $4,000. His foremost investing premise is risk mitigation. He writes,

I too believe that avoiding loss should be the primary goal of every investor. This does not mean that investors should never incur the risk of any loss at all. Rather “don’t lose money” means that over several years an investment portfolio should not be exposed to appreciable loss of principal.

Compounding your savings at an average rate offers big advantages over time. But compounding works equally well in the opposite direction.

…perseverance at even relatively modest rates of return is of the utmost importance in compounding your net worth. A corollary to the importance of compounding is that it is very difficult to recover from even one large loss, which could literally destroy all at once the beneficial effects of many years of investment success. In other words, an investor is more likely to do well by achieving consistently good returns with limited downside risk than by achieving volatile and sometimes even spectacular gains but with considerable risk of principal.

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