Unlike return, however, risk is no more quantifiable at the end of an investment that it was at its beginning. Risk simply cannot be described by a single number. Intuitively we understand that risk varies from investment to investment: a government bond is not as risky as the stock of a high-technology company. But investments do not provide information about their risks the way food packages provide nutritional data.

Do not trust financial market risk models. Despite the predilection of some analysts to model the financial markets using sophisticated mathematics, the markets are governed by behavioral science, not physical science.

There are no long-term lessons - ever.

Do not accept principal risk while investing short-term cash: the greedy effort to earn a few extra basis points of yield inevitably leads to the incurrence of greater risk, which increases the likelihood of losses and severe illiquidity at precisely the moment when cash is needed to cover expenses, to meet commitments, or to make compelling long-term investments.

Interestingly, we have beaten the market quite handsomely over this time frame, although beating the market has never been our objective. Rather, we have consistently tried not to lose money and, in doing so, have not only protected on the downside but also outperformed on the upside.

Below, we itemize some of the quite different lessons investors seem to have learned as of late 2009 - false lessons, we believe. To not only learn but also effectively implement investment lessons requires a disciplined, often contrary, and long-term-oriented investment approach. It requires a resolute focus on risk aversion rather than maximizing immediate returns, as well as an understanding of history, a sense of financial market cycles, and, at times, extraordinary patience.

One thing I want to emphasize is that, like any human being, we can discuss our view of the economy and the market. Fortunately for our clients, we don't tend to operate based on the view. Our investment strategy is to invest bottom up, one stock at a time, based on price compared to value. And while we may have a macro view that things aren't very good right now - which in fact we feel very strongly we will put money to work regardless of that macro view if we find bargains. So tomorrow, if we found half a dozen bargains, we would invest all our cash.