We've reached the end. It's time we all learn Graham's secret.
The secret to sound investment is “MARGIN OF SAFETY”, so writes Graham in the opening paragraph of chapter 20. As he says, “it is the thread that runs through all of the preceding discussion of investment policy.”
So what is “margin of safety”, it is “rendering unnecessary an accurate estimate of the future. If the margin is a large one, then it is enough to assume that future earnings will not fall below those of the past in order for an investor to feel sufficiently protected against the vicissitudes of time.”
When considering this concept for common stock investments, Graham spoke of identifying the margin of safety as related to the earnings power of the company relative to the going rate for bonds. You can probably just call this a sufficient “risk premium”. Graham would consider the earnings yield (E/P) relative to risk-free rates, and if the earnings yield was 50% or more greater than the risk-free rate, Graham would consider that a very good margin of safety.
Graham goes on to caution that true earnings power typically can only come from observation over many years. It is a note of caution against “growth stocks” and investors relying on optimistic projections of future earnings as the basis of “earnings power” when considering margin of safety. He doesn’t dismiss growth stocks outright, simply cautions that some level of conservation is necessary in underwriting their future earnings.
Go all the way back to Chapter 1, remember that Graham defines investing as requiring deliberate protection against serious loss, any operation that fails to include that criteria is “speculation” in Graham’s book, thus Graham states: “we say that to have a true investment there must be present a true margin of safety. And a true margin of safety is one that can be demonstrated by figures, persuasive reasoning, and by a body of actual experience.”
Enterprising investing, or the business of investing is a tough business, Graham sets a high, business-oriented bar for those who are seeking to truly manage a stock portfolio.
But what about the rest of us, those who don’t want to try to hurdle that bar? Graham’s advice is simple, stay the path of narrow defensive investment. “To achieve satisfactory investment results is easier than most people realize; to achieve superior results is harder than it looks.”
Commenting on Commentary on Chapter 20
Zweig opens up his commentary with a simple question: “What is Risk?” People posit many answers, but Zweig offers up simple advice, that investment risk is the possibility of losing all or most of your money.
Zweig reminds readers that risk is not simply about probabilities, it's equally about consequences. He cites one of my favorite quotes from Bernstein’s book “Against The Gods”, stating: “In making decisions under conditions of uncertainty, the consequences must dominate the probabilities. We never know the future.”
The central theme of Graham’s teaching here is that investing isn’t just about getting the analysis right, you have to ensure that if you’re wrong you can survive.
In years of thinking about risk, I think an often overlooked aspect of “risk” is the setting of goals, it’s knowing what you want to achieve. I feel like this is fundamental to providing context to risk and it seems clear that misspecification of goals is a risk we don’t talk enough about, it is the entire framing for how much return you might need and evaluation of various paths to reach that goal. “Taking a risk on the unknown for its own sake is a bad risk strategy.”
My lay advice: Know your goals, mitigate unwanted risk, prepare and position the best you can for when the unknown or unexpected occurs, because life is uncertain, but remember without risk there is no return.
“If we fail to anticipate the unforeseen or expect the unexpected in a universe of infinite possibilities, we may find ourselves at the mercy of anyone or anything that cannot be programmed, categorized, or easily referenced.”
Agent Fox Mulder, The X-Files