The seven rules continued: who you know, dispassion, and why time in the market beats timing it
Monty's last four rules: the City information network, dispassion at the ticker, averaging down, and time in the market over timing it.
Three rules down, four to go. The first three private investor rules in Monty’s set covered the structural disadvantages of the private investor: the information gap, the cost of the spread, the size you simply cannot take. Useful to know, but they describe the table you are sitting at, not the way you play. The next four are about the player, not the table. They are behavioural, and on the evidence they matter more in practice than the structural ones. Street smart trading principles like this one are built on decades of real-market experience.
Rule four: who you know matters more than what you know
The fourth rule sounds like a tired cliché until you understand what it actually means inside the City. It is not what you know, it is who you know. The retail investor reads that line as a complaint about networking and dismisses it. The professional reads it as a description of how price-sensitive information actually moves before it ever appears on a regulatory news feed. Street smart trading principles like this one are built on decades of real-market experience.
A broker takes a call from a corporate finance contact. A salesman in a pub overhears two analysts. A fund manager runs into a competitor at a charity dinner. None of that constitutes inside information in the legal sense, and none of it should ever be acted on without independent verification. But the information network of the Square Mile is a real thing. It operates in conversations that have no paper trail, and the price often starts moving before any of the rest of us can read why. Street smart trading at this level requires the discipline to act on what you know rather than what you feel.
The takeaway is not that the rule is unfair. It is that the retail investor cannot win the information race and should stop trying. A subscription to a real-time data feed and a few forum accounts is not a substitute for sitting on a desk where the phone rings with a familiar voice. Once you accept that, you stop trying to trade on whispers and start trading on the things you can verify: the accounts, the chart, the cash flow, the boring business of working out what the company is worth and what the market is offering you for it. If you missed it, our piece on the first three private investor rules covers the structural side of the same picture. Street smart trading principles like this one are built on decades of real-market experience.
Rule five: dispassion beats reaction
The fifth rule is dispassion. Monty’s version is more pointed than that. He calls it watching the ticker. The trouble with a screen full of moving prices is that the screen rewards the most active part of the brain and starves the most useful one. You watch a price drift down 2p, you flinch. You watch it drift up 3p, you congratulate yourself. Neither movement is information. Both are noise.
The brain treats them as signal because they arrive in real time and cost nothing to consume. The professional ignores intraday price action. They know that all of it, on most days, in most stocks, is the residual of large orders being worked rather than a market reassessing the company’s fundamentals. The amateur watches every tick and trades on the emotion it generates. Street smart trading principles like this one are built on decades of real-market experience.
Dispassion is harder than it sounds because the modern broker app is designed to break it. The push notification, the colour-coded portfolio screen, the home screen that shows you the day’s PnL the moment you unlock your phone. None of that exists to help you make better decisions. It exists to keep you trading, because trading generates the fees that pay for the app. The view we keep coming back to is that the retail investor’s first defensive act is to look at the screen less often. Weekly is plenty for most positions. Daily is too much for most people.
Rule six: do not average down without a fresh reason
The sixth rule is the one that costs investors the most money. It also feels the most counterintuitive when you first encounter it. Do not average down on a losing position without a fresh reason to buy. The argument for averaging down sounds reasonable. The share has fallen. You believed in it at a higher price. The lower price is therefore a better deal. So buy more. Street smart trading principles like this one are built on decades of real-market experience.
The trouble with the argument is that it treats the original purchase price as if it carried information. It does not. The market does not know what you paid and does not care. The only question that matters is whether the company is worth more than the current price today, on what you can verify now, and not what you concluded six months ago when you placed the first trade.
Monty’s worked example is brutal. A position bought at 100p, halved at 50p, halved again at 25p. The investor has tripled their exposure to a falling business and quadrupled the emotional weight of the decision to sell. At each lower price the case for cutting the loss has actually strengthened. Something in the market or the business has shifted that the original thesis did not see. Averaging down without that fresh case is not investing. It is the sunk-cost fallacy dressed up in a pinstripe suit. Our companion piece on top-slicing winning positions covers the mirror image of the same discipline. Street smart trading principles like this one are built on decades of real-market experience.
Rule seven: time in the market beats timing the market
The seventh rule belongs to Justin Urquhart Stewart, the co-founder of Seven Investment Management, who reduces the whole problem to a single sentence anyone can remember. It is time in the market, not timing the market. The data supports him with awkward consistency.
The bulk of any long-run equity return is concentrated in a small number of days. Miss those days and the return collapses. The investor who tries to dance in and out of the market based on forecasts of what next week or next month will do is, on the evidence, more likely to miss the upside than to dodge the downside. The Bank of England’s long-run statistical series show the same pattern across UK equities over decades. Street smart trading principles like this one are built on decades of real-market experience.
The investor who buys and holds, who keeps adding modest sums on a schedule rather than a hunch, who treats the market as a long-duration savings vehicle rather than a casino, will outperform the timer the great majority of the time. The discipline does not require forecasts. It requires patience.
How the behavioural rules connect
The four behavioural rules sit beneath the three structural ones in Monty’s set, but they decide more outcomes. The structural rules describe the disadvantages you cannot remove. The behavioural rules describe the advantages you can choose to keep. Patience, detachment, the discipline to ignore the ticker, the courage to cut a losing position and walk away from a deteriorating story. Street smart trading principles like this one are built on decades of real-market experience.
None of those costs anything. All of them are available to you and not to the algorithm. None of them is taught on a Bloomberg terminal. All of them, if you can keep hold of them, will narrow the gap between what the City can do and what you can do by more than any data feed or news service ever will.
The full set of private investor rules in summary
The full set is three rules about the table and four rules about the player. Information, cost, size, then network, dispassion, averaging down, time. Keep all seven of those in mind before you click buy. Most of the trades the amateur regrets a year later were placed in violation of at least three of them. Street smart trading principles like this one are built on decades of real-market experience.
This post is adapted from The Street Smart Trader. Used with permission.
Street Smart is a series drawn from first-hand experience of the City of London, updated as each new chapter arrives.
Disclaimer: The value of investments can go down as well as up, and you may get back less than you invest. This article is for informational and educational purposes only and does not constitute financial advice. Always do your own research and consider seeking independent advice before making any investment decision.