Capitalistic Musings | Page 8

the future. Technical analysis has often been compared to voodoo, alchemy, and astrology - for instance by Burton Malkiel in his seminal work, "A Random Walk Down Wall Street."
The paradox is that technicians are more orthodox than the most devout academic. They adhere to the strong version of market efficiency. The market is so efficient, they say, that nothing can be gleaned from fundamental analysis. All fundamental insights, information, and analyses are already reflected in the price. This is why one can deduce future prices from past and present ones.
Jack Schwager, sums it up in his book "Schwager on Futures: Technical Analysis", quoted by Stockcharts.com, :
"One way of viewing it is that markets may witness extended periods of random fluctuation, interspersed with shorter periods of nonrandom behavior. The goal of the chartist is to identify those periods (i.e. major trends)."
Not so, retort the fundamentalists. The fair value of a security or a market can be derived from available information using mathematical models - but is rarely reflected in prices. This is the weak version of the market efficiency hypothesis.
The mathematically convenient idealization of the efficient market, though, has been debunked in numerous studies. These are efficiently summarized in Craig McKinlay and Andrew Lo's tome "A Non-random Walk Down Wall Street" published in 1999.
Not all markets are strongly efficient. Most of them sport weak or "semi-strong" efficiency. In some markets, a filter model - one that dictates the timing of sales and purchases - could prove useful. This is especially true when the equilibrium price of a share - or of the market as a whole - changes as a result of externalities.
Substantive news, change in management, an oil shock, a terrorist attack, an accounting scandal, an FDA approval, a major contract, or a natural, or man-made disaster - all cause share prices and market indices to break the boundaries of the price band that they have occupied. Technical analysts identify these boundaries and trace breakthroughs and their outcomes in terms of prices.
Technical analysis may be nothing more than a self-fulfilling prophecy, though. The more devotees it has, the stronger it affects the shares or markets it analyses. Investors move in herds and are inclined to seek patterns in the often bewildering marketplace. As opposed to the assumptions underlying the classic theory of portfolio analysis - investors do remember past prices. They hesitate before they cross certain numerical thresholds.
But this herd mentality is also the Achilles heel of technical analysis. If everyone were to follow its guidance - it would have been rendered useless. If everyone were to buy and sell at the same time - based on the same technical advice - price advantages would have been arbitraged away instantaneously. Technical analysis is about privileged information to the privileged few - though not too few, lest prices are not swayed.
Studies cited in Edwin Elton and Martin Gruber's "Modern Portfolio Theory and Investment Analysis" and elsewhere show that a filter model - trading with technical analysis - is preferable to a "buy and hold" strategy but inferior to trading at random. Trading against recommendations issued by a technical analysis model and with them - yielded the same results. Fama-Blum discovered that the advantage proffered by such models is identical to transaction costs.
The proponents of technical analysis claim that rather than forming investor psychology - it reflects their risk aversion at different price levels. Moreover, the borders between the two forms of analysis - technical and fundamental - are less sharply demarcated nowadays. "Fundamentalists" insert past prices and volume data in their models - and "technicians" incorporate arcana such as the dividend stream and past earnings in theirs.
It is not clear why should fundamental analysis be considered superior to its technical alternative. If prices incorporate all the information known and reflect it - predicting future prices would be impossible regardless of the method employed. Conversely, if prices do not reflect all the information available, then surely investor psychology is as important a factor as the firm's - now oft-discredited - financial statements?
Prices, after all, are the outcome of numerous interactions among market participants, their greed, fears, hopes, expectations, and risk aversion. Surely studying this emotional and cognitive landscape is as crucial as figuring the effects of cuts in interest rates or a change of CEO?
Still, even if we accept the rigorous version of market efficiency - i.e., as Aswath Damodaran of the Stern Business School at NYU puts it, that market prices are "unbiased estimates of the true value of investments" - prices do react to new information - and, more importantly, to anticipated information. It takes them time to do so. Their reaction constitutes a trend and identifying this trend at its inception can generate excess yields. On this both fundamental and technical analysis are agreed.
Moreover, markets often over-react: they undershoot