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Discussion of Portfolio Theory - Coursework Example

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The combination depends on the investor’s risk appetite. Thus, the whole concept of portfolio theory relates to the fund used to buy risky asset. Let us assume, the entire financial market consists of three stocks, those of company X, company Y, and company Z in the following manner; X’s market capitalization is \$1 billion; Y’s is \$2 billion, and Z’s is \$3 billion (INVESTOPEDIA). Thus, total financial market value is \$6 billion, and market portfolio would consist of 17 % X stock; 33% Y stock, and 50% Z stock. Corporate investors use the same concept when they build up a portfolio. The above discussion demonstrates that asset is a weight in the portfolio. An investor never buys all securities of the financial market; rather selects a combination of securities. This is when the concept of risk arises. Thus, portfolio theory has two important parameters: weight of an asset in the portfolio and its risk. The concept risk relates to the return on investment. Let us consider a single stock A. The stock A has predicted returns for different economic states as well as the probability of occurring these states. Theoretically three states are considered: boom, average, and recession. Using formulas, one can calculate expected return, E (rA), and risk of the return of the stock A. The risk of return is expressed through standard deviation ?, and in percentage. A portfolio consists of multiple financial instruments, each of them with specific predicted returns. Let us now say, we have three securities

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in a portfolio: stock B, stock C, and stock D. The portfolio return will be E (r portfolio) = WB x E (rB) + WC x E (rC) + WD x E (rD). The value of E (r Portfolio) will compensate the risk of each single security. Example (Sepand Jazzi): A portfolio consists of Gold Stock, Auto Stock with relative weight 75 % and 25 %. The return is shown below. Economic Probability Auto Stock Gold Stock Average Stock State Return Return Return Recession 33.33% - 8 % 20 % 0.085 Average 33.33% 5 % 3 % 0.045 Boom 33.33% 18% -20% 0.01 Step 1: Convert predicted returns of two stocks to the return of one average stock. The formula is Average predicted return = Weight of Auto stock x Predicted return + Weight of Gold stock x Predicted return. Using formula, E(r) = ? Ri x P (Ri), where, i = 1, 2, we calculate expected return of the portfolio. The portfolio expected return is E(r portfolio) = 4 %. Using the predicted value of return of Average stock for each economic state and probability, we can calculate the risk of the portfolio. In this case, it is 3.89 %. This value is lower than individual risk values for Auto stock and Gold stock. Cost of capital is the rate of return of the given investment of a company. The portfolio theory uses Capital Asset Pricing Model (CAPM) to evaluate the cost of capital. This model considers the risk of return and historical return of stock market. The formula for the evaluation of rate of return is Expected rate of return on a security = Rate of risk free investment + (Volatility of a security, relative to the asset class) x (market premium), or ri = rf + ? (rm-rf). Example: Company ? = 1.4 Rf = 5 %, risk free return E [rM] = 13 %, historical stock market return. E[r] = 5 % + 1.4 (13 % - 4 %) = 16.2 % = Cost of capital Part 2 Investment is associated with risk and return, which are quantified, and interdependent; less risk less return, and more risk more return. We can graphically display this dependency on risk – return plane using CAPM model. In this model, risk is expressed through a parameter ?, and return through another parameter E (Ri). Algebraic expression of the model is E (Ri) = Rf + [E (Rm) –
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Summary

The portfolio theory originated with the use of asset-pricing concept as an investment instrument. Investment instrument is an asset that can be bought and sold. The portfolio theory defines that an investor will buy a single risky fund plus a risk-free asset. …
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