Security-Market Indicator Series Eco. Juan Francisco Rumbea.

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Presentation transcript:

Security-Market Indicator Series Eco. Juan Francisco Rumbea

Security-Market Indexes Used in areas of investment management: Measuring portfolio performance over various time periods. Helping in the construction of index portfolios. Evaluating the financial variables that influence overall security price movements. Aiding market technicians in their investment decisions. Helping in the calculation of beta and portfolio theory studies.

Security-Market Indexes Intended to represent the behavior of a market. When constructing an index, it’s important to consider: The sample must be representative of the population. The weighting to give the individual items in your sample. The mathematical or computational procedure to use in order to combine the individual items into the whole index.

A price-weighted Index Arithmetical average of current security prices. Movements in the series are influenced by the different prices of the index components. Computationally, this index adds together the market price of each stock in the index and then divides this total by the number of stocks in the index. The returns on a price-weighted index could be matched by purchasing an equal number of shares of each stock represented in the index.

A price-weighted Index Price-weighted index = Price-weighted index = sum of stock prices / number of stocks in index adjusted for splits The two major price-weighted indexes are: Dow Jones Industrial Average (DJIA) Nikkei Dow Jones Stock Average

A market value-weighted Index Calculated by summing the total value (current stock price times the number of shares outstanding) of all stocks in the index. This sum is divided by a similar sum calculated during the selected base period. The ratio is then multiplied by the index’s base value (typically 100). A value-weighted index assumes you make a proportionate market value investment in each company in the index. The major problem with this index is that firms with greater market capitalization have greater impact on the index than firms with lower market capitalization.

A market value-weighted Index Major market value-weighted indexes: Standard & Pool’s 500 (S&P 500) Index Composite New York Stock Exchange Index (NYSE) Other U.S. value-weighted series include the NASDAQ series, the AMEX Market Value Index, the Dow Jones Equity Market Index, the Wilshire 5000 Equity Index, and the Russell Index. The Morgan Stanley Capital International Indexes, the Dow Jones World Stock Index, the Salomon-Russell World Equity Index.

An unweighted Index Places an equal weight on the returns of all index stocks, regardless of their prices or market values. The procedure to compute that index assumes that the index portfolio makes and maintains an equal dollar investment in each stock in the index.

Methods to calculate an unweighted Index Arithmetic mean: Change in the average index value = (∑X i )/n, where X i = the return on each stock from time = t to time = t + 1. Geometric mean: Change in the average index = Where X i = (1 + HPR i ) = (Price t+1 )/(Price t ) for stock i. The use of the geometric mean rather than the arithmetic mean will result in a lower index value. The geometric mean of returns is always less than the arithmetic mean, unless all returns are equal.

Sources and Direction of Bias Price-weighting bias Once a price-weighted index is established, the denominator must be adjusted to reflect stock splits and changes in the sample over time. After a stock split, the denominator is adjusted downward, so the index is the same before and after split. Value-weighting bias The major problem with a value-weighted index is that firms with greater market capitalization have a greater impact on the index than firms with lower market capitalization. Unweighted bias The use of geometric mean rather than the arithmetic mean causes a downward bias in the index. The geometric average will always be lower than the arithmetic average unless all stocks have equal-percentage price changes.

Example: Price-weighted index Given the information for the three stocks presented in the table, calculate a price-weighted and value-weighted index return over a 1-month period. As of December 31, 2006As of January 31, 2007 Share Price Number of Shares Outstanding (000’s) Total Market Value (000’s) Share Price Number of Shares Outstanding (000’s) Total Market Value (000’s) Stock X$103,000$30,000$203,000$60,000 Stock Y$201,000$20,000$151,000$15,000 Stock Z$60500$30,000$40500$20,000 Total$904,500$80,000$754,500$95,000

Answer The price-weighted index is [( )/3] = 30 as of December 31 and [( )/3] = 25 as of January 31. hence, the price-weighted 1-month percentage return is: (25/30) -1 = -16.7% Value-weighted indexes normally use a beginning (base year) index value of 100. the total market values of the index portfolio on December 31 are $80 million and $95 million, respectively. So the index value at the end of January is: Current index value = (current total market value of index stocks/base year total market value of index stocks) x base year index value Current index value = ($95 million/$80 million) x 100 = Thus, the value-weighted index percentage return is: (118.75/100) – 1 = 18.75%

Example: Price-weighted vs. market-weighted indexes Consider the three firms described in the table: Index Firm Data Company Number of Shares (000’s) Stock Price Capitalization (000’s) A100$100$10,000 B1,000$10$10,000 C20,000$1$20,000

Answer The price-weighted index equals: ( )/3 = 37 If stock A doubles in price to $200, the index value is: ( )/3 = If stock C doubles in price to $2, the index value is: ( )/3 = If A doubles in value, the index goes up points; while if C doubles value, the index only goes up 0.33 points. Changes in value of the firm with the highest stock price have a disproportionately large influence on a price-weighted index.

Answer Using a base capitalization of $40,000,000 = [(100,000 x $100) + (1,000,000 x $10) + (20,000,000 x $1)] and a base index value of 100, we can also calculate the market value-weighted index return. If stock A doubles in price to $200, the index goes to: [(100,000 x $ ,000,000 x $ ,000,000 x $1) / $40,000,00] x 100 = 125 If stock C doubles in price to $2, the index goes to: [(100,000 x $ ,000,000 x $ ,000,000 x $2) / $40,000,00] x 100 = 150 In the market value-weighted index, the returns on Stock C have the greatest influence on the index return because Stock C’s market capitalization is larger than that of Stock A and Stock B. Note that the value-weighted index automatically adjusts for stock splits.

Example: Unweighted index Calculate both the arithmetical and geometric unweighted index values for the three stocks described in the table, assuming an initial index value of 131. Unweighted Index Data StockInitial PriceCurrent PricePrice Change A$12.00$ % B$52.00$ % C$38.00$ %

Answer Arithmetic: Change in index = (25% - 7.7% %)/3 = 11.9% New index value = 131 ( ) = Geometric: Change in index = (1.25 x x 1.184) 1/3 – 1 = 10.96% New index value = 131 ( ) = Using the geometric mean instead of the arithmetic mea generates a lower unweighted index value.

Major structural features Domestic equity indexes: Domestic equity indexes: The Dow Jones Industrial Average in the U.S. and the Nikkei Dow Jones Stock Market Average for Japan’s Tokyo Stock Exchange. Global equity indexes: Global equity indexes: Created to circumvent the comparability problems with using locally created indexes. Bond market indexes: Bond market indexes: Relatively new. The creation of bond market indexes is more difficult than stock market indexes because: The bond universe is much broader. The bond universe is changing constantly. The price volatility of a bond is constantly changing. Basic categories of bonds: Investment-grade bond indexes High-yield bond indexes Global bond indexes

Composite stock-bond indexes & Comparison of indexes over time Composite stock-bond indexes: Composite stock-bond indexes: Measure the performance of all securities in a given country. Comparison of indexes over time: The risk/return performances of indexes are different. Different indexes represent different asset classes (stock vs. bonds). Within a given asset class, there are indexes for different subclasses. Studies have found a low correlation to exist between indexes within a given country and between different countries. Findings that support the argument for diversification (domestically and globally).