Investing is the intersection of economics and psychology. The analysis is actually the easy part. The economics, the valuation of the business isn't that hard. The psychology - how much do you buy, do you buy it at this price, do you wait for a lower price, what do you do when it looks like the world might end - those things are harder. Knowing whether you stand there, buy more, or whether something has legitimately gone wrong and you need to sell, those are harder things. That you learn with experience, by having the right psychological makeup.

A tipping point is invisible, as we just saw in Greece. In most situations, everything appears fine until it's not fine, until, for example, no one shows up at a Treasury auction.

Excess capacity in people, machines, or property will be quickly absorbed.

Avoid organizing investment team into silos.

Investors should always keep in mind that the most important metric is not the returns achieved but the returns weighed against the risks incurred. Ultimately, nothing should be more important to investors than the ability to sleep soundly at night.

Value in relation to price, not price alone, must determine your investment decisions. If you look to Mr Market as a creator of investment opportunities (where price departs from underlying value), you have the makings of a value investor. If you insist on looking to Mr Market for investment guidance however, you are probably best advised to hire someone else to manage your money.

Gold is unique because it has the age-old aspect of being viewed as a store of value. Nevertheless, it’s still a commodity and has no tangible value, and so I would say that gold is a speculation. But because of my fear about the potential debasing of paper money and about paper money not being a store of value, I want some exposure to gold.