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Portfolio management and efficient market hypothesis

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1 Portfolio management and efficient market hypothesis

2 Traditional investments covers:
Security analysis Involves estimating the merits of individual investments Portfolio management Deals with the construction and maintenance of a collection of investments

3 Security Analysis A three-step process
The analyst considers prospects for the economy, given the state of the business cycle The analyst determines which industries are likely to fare well in the forecasted economic conditions The analyst chooses particular companies within the favored industries EIC analysis (a top-down approach)

4 Literature supports the efficient markets paradigm
On a well-developed securities exchange, asset prices accurately reflect the tradeoff between relative risk and potential returns of a security Efforts to identify undervalued securities are fruitless Free lunches are difficult to find

5 Market efficiency and portfolio management
A properly constructed portfolio achieves a given level of expected return with the least possible risk Portfolio managers have a duty to create the best possible collection of investments for each customer’s unique needs and circumstances

6 Portfolio management primarily involves reducing risk rather than increasing return
Consider two $10,000 investments: Earns 10% per year for each of ten years (low risk) Earns 9%, -11%, 10%, 8%, 12%, 46%, 8%, 20%, -12%, and 10% in the ten years, respectively (high risk)

7 The Six Steps of Portfolio Management
Learn the basic principles of finance Set portfolio objectives Formulate an investment strategy Have a game plan for portfolio revision Evaluate performance Protect the portfolio when appropriate

8 Portfolio Management Passive management has the following characteristics: Follow a predetermined investment strategy that is invariant to market conditions or Do nothing Let the chips fall where they may

9 Active management: Requires the periodic changing of the portfolio components as the manager’s outlook for the market changes

10 Performance evaluation
Did the portfolio manager do what he or she was hired to do? Someone needs to verify that the firm followed directions Interpreting the numbers How much did the portfolio earn? How much risk did the portfolio bear? Must consider return in conjunction with risk

11 Efficient Market Hypothesis
The efficient market hypothesis (EMH) is the theory supporting the notion that market prices are in fact fair Under the EMH, security prices fully and fairly (i.e., without bias) reflect all available information about the security Since the 1960’s, the EMH has been perhaps the most important paradigm in finance Whether markets are efficient has been extensively researched and remains controversial

12 Types of Efficiency Operational efficiency measures how well things function in terms of speed of execution and accuracy It is a function of the number of orders that are lost or filled incorrectly It is a function of the elapsed time between the receipt of an order and its execution

13 Informational efficiency is a measure of how quickly and accurately the market reacts to new information This is the type of efficiency with which the EMH is concerned The market is informationally very efficient Security prices adjust rapidly and fairly accurately to new information However, as we’ve already seen, the market is still not completely efficient

14 Forms of Market Efficiency
Eugene Fama’s original formulation of the Efficient Market Hypothesis established three forms of market efficiency, based on the level of information reflected in security prices: Weak form = prices reflect all past market level (price and volume) information Semi-strong form = prices also reflect all publicly available fundamental company and economic information Strong form = prices also reflect all privately held information that would affect the value of the company and its securities

15 Weak form The weak form of the EMH states that it is impossible to predict future stock prices by analyzing prices from the past The current price is a fair one that considers any information contained in the past price data Charting techniques are of no use in predicting stock prices

16 Semi-Strong Form The semi-strong form of the EMH states that security prices fully reflect all publicly available information e.g., past stock prices, economic reports, brokerage firm recommendations, investment advisory letters, etc.

17 Strong Form The strong form of the EMH states that security prices fully reflect all relevant public and private information This would mean even corporate insiders cannot make abnormal profits by using inside information about their company Inside information is information not available to the general public

18 End


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