Selling, in particular, can be a challenge; many investors are tempted to become more optimistic when a security is performing well. This temptation must be resisted; tax considerations aside, when a security reaches full valuation, there is no longer a reason to own it.

Limit risk with: Deep analysis Bargain purchase Sensitivity analysis.

Markets need not be in sync with one another. Simultaneously, the bond market can be priced for sustained tough times, the equity market for a strong recovery, and gold for high inflation. Such an apparent disconnect is indefinitely sustainable.

Targeting investment returns leads investors to focus on potential upside rather on downside risk ... rather than targeting a desired rate of return, even an eminently reasonable one, investors should target risk.

The government can always rescue the markets or interfere with contract law whenever it deems convenient with little or no apparent cost. (Investors believe this now and, worse still, the government believes it as well. We are probably doomed to a lasting legacy of government tampering with financial markets and the economy, which is likely to create the mother of all moral hazards. The government is blissfully unaware of the wisdom of Friedrich Hayek: "The curious task of economics is to demonstrate to men how little they really know about what they imagine they can design.")

A margin of safety is achieved when securities are purchased at prices sufficiently below underlying value to allow for human error, bad luck, or extreme volatility in a complex, unpredictable and rapidly changing world.

Pressure to produce over the short term - a gun to the head of everyone - encourages excessive risk taking which manifests itself in several ways - fully invested posture at all times, the use of leverage, and a market centric orientation that makes it difficult to stand apart from the crowd and take a long term perspective.