Stock Trading Method
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The Contrarian Stock Trader |
A View of Reward, Risk and Ruin in the Markets |
Investment Strategies Benoit Mandelbrot, the famous mathematician and inventor of fractal geometry, has forever changed the way we understand many natural phenomena and influenced a host of modern fields from chaos theory to the financial markets. Before Mandelbrot, the modern theory of finance used in most existing investment models, was based on the following shaky assumptions: - People make rational assumptions. When given all the relevant information about an investment, individual investors will make the obvious rational choice leading to the greatest wealth. Thus the sum total of all investor's actions will result in an efficient market, with all of their rational actions driving prices quickly to their "correct" level. Rational investors make for a rational market. In Reality, people are hardly ever rational and self-interested. Behavioral economics show how people misinterpret in formation, how emotions of fear and greed distort their decisions, and how they miscalculate probabilities of reward, risk and ruin. - All Investors are alike. People have the same investment goals and hold their investments for the same periods. With the same information, they will make identical decisions. Thus a model that describes one investor describes them all. In Reality, people are not alike. Some buy and hold stocks for a long time, others day trade. Some look for stocks in fundamentally solid companies that are going through a correction; others try to get on board rapidly rising stocks. Without homogeneity, the mathematical models of the market become very complicated. The market changes from a well- behaved system, with predictable outcome, to a chaotic one with unanticipated results. - Price Change is more or less continuous. Stock prices always move smoothly from one value to the next i.e. the market is subject to the natural law of inertia and, once in motion at a certain speed, will tend to continue to move at that speed. In Reality, this smooth stock movement is interrupted by sudden jumps all the time. Discontinuity is an integral ingredient of the markets and cannot be ignored. - Each price change is independent from the last and the process generating these price changes stays the same over time. Also, price changes follow the bell curve with mostly small changes and extremely few large ones. In Reality, life is more complex and markets do have a memory, i.e. what happens now will be reflected in behavior far into the future. Based on chaos theory and fractal geometry, Mandelbrot describes the characteristics of the markets as follows: 1. Markets are Turbulent Their behavior can be compared to the behavior of flowing fluids when reaching certain speeds. When a liquid or gas runs slowly through a tube, the flow is nice and smooth. This kind of flow is called laminar. As the flow accelerates, here and there it breaks into sharp and intermittent eddies; these eddies produce yet more, smaller eddies and a cascade of whirlpools, from great to small , appears. This is turbulent flow. The suddenly smooth flow returns momentarily. Then more turbulence followed by smooth flow. The same kind of turbulence happens in the financial markets with abrupt lurches between mild motion and quiet activity, discontinuities, and concentrations of major events in time. 2. Markets are very Risky Turbulence is dangerous. Its output can swing wildly and suddenly. It is hard to predict, harder to protect against, and hardest of all to profit from. 3. Market Timing is very Important Big gains and losses occur into small packages of time. Concentration of major events, and volatility, is common. 4. Prices often leap, not glide That financial prices often jump, skip and leap up or down adds to the investment risk. 5. In Markets, Time is flexible The same risk factors apply to a day as to a year, an hour as to a month. Only the magnitude differs, not the proportions. That 's why charts with different time scales look the same. Statistically speaking, the risk of a day is much like that of a week, a month or a year. Only the price variations, and thus the magnitude of potential wins or losses, scale with time. 6.Markets in all Places and Ages work alike One of the surprising conclusions of fractal market analysis is the similarity of variables from one type of market to another. Also, the patterns, in space or time, remain the same even as the scale of observation changes. Finding market properties that remain constant over time and place means you can make better, more useful models and make sounder financial decisions. 7. The Distribution of Price Changes Scales The proportion of big changes to small changes in a financial price series follows a consistent pattern. This results in wilder price swings than you might otherwise expect. Scaling means that the odds that a massive price movement will follow a large one are the same as merely a sizable one following large movement. 8. Markets are Deceptive The long-range dependence in prices creates a tendency in the data-not towards any particular price level, but towards price ranges of a particular size or direction. The change may be persistent and reinforce each other, i.e. a trend once started tends to continue,or the trend once started may reverse. Persistent trends appear to display long, slow, up-down cycles of three. 9. Volatility clusters Large price changes tend to be followed by more large changes up or down, and small changes by more small changes up o or down. 10. In Financial Markets, the Idea of "Value" is useless What is the value of a company, and how does this number correlate with the price of its shares? There seems to be no correlation, no matter how you define this value. For example, the most common index for market value is the price-earnings ratio, or P/E. Taking Cisco Systems as an example. At its peak during the Internet bubble, its forward looking P/E reached a value of 137. If this was the actual intrinsic value, you have had to assume that earnings would keep up its torrid pace for at least another decade. At this point Cisco's market value would have been more than the annual production of the entire U.S. economy! After the bubble burst, Cisco's P/E fell to 26, even though its earnings growth was actually faster than during the bubble days. CONCLUSIONS How do we thrive in such an existentialist world? People make money in the markets all the time. Based on the new chaotic, fractal model of the markets, here follow the most important ideas to adhere to when investing in the financial markets: What really counts are price differences not value or price. The only thing to keep in mind is that, to make money, your selling price has to be higher than your buying price and, obviously, the greater the difference in these two prices, the bigger your profit. Thus the general idea that you should "buy low and sell high" is really misleading since it entices investor to waste a lot of time finding low priced stocks with a potential of moving higher. Any stock, at any price, has the potential to move up or down! Thus the stock price is not a criterion in trade selection. A Trend once started tends to keep going There is a long-range dependence in price changes of a particular size and direction. The changes can be persistent and thus reinforce each other. In this case a started trend will keep on going. Thus an investor should look for strong trends with large price changes. Reversals can happen any time Sometime the price changes are anti-persistent and a trend in one direction may reverse itself. Also, any trend will eventually come to an end. Such events are not predictable and an investor should confirm that the stock he wants to buy is still moving in the right direction prior to pulling the trigger, and, once in the market, always use stops. The "Buy and Hold" Strategy is Dangerous Many financial advisers and stock brokers always seem optimistic about the stock market and promote the buy and hold system whereby you buy a stock- usually on their recommendation- and hold it for many years. Since the risk is independent of the time scale, i.e. long-term investing is just as risky as short-term investing, but the magnitude of potential losses scales with time, the risk of ruin with a long-term commitment is much greater than with a short-term exposure to the market. Lots of people lost a lot of money when their "long-term investment" turned sour when the Dot.com bubble burst! I know people, planning to retire early based on their huge gains during the bubble, who now believe they will never able to retire because they lost all their investments during the subsequent crash. Putting it all together To make money in the stock market, buy (or short sell) stocks in a strong trend with a strong momentum (a stock with big price changes in one direction). Place a tight stop to minimize a potential loss and continuously adjust your stop to protect your gains. Get out at the first reversal. This method will give you a good chance for profit with the least exposure to the market and thus minimum risk . Since the markets are inherently risky, it is prudent to only use less than 50% of your discretionary money for stock market investing. |
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Copyright 2009 Hugo vandenBergh. All rights reserved. |
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Hugo vandenBergh Magister Contradictionis |