Book 3_Equity_READING 42_SECURITY MARKET INDEXES Flashcards
A security market index
represents the performance of an asset class, security market, or segment of a market
The performance of the market or segment over a period of time
is represented by the percentage change in (i.e., the return on) the value of the index.
A price index
uses only the prices of the constituent securities in the return calculation
A total return index
uses both the price of and the income from the index securities in the return calculation
Decisions that index providers must make when constructing and managing indexes
- The target market the index will measure.
- Which securities from the target market to include.
- The appropriate weighting method.
- How frequently to rebalance the index to its target weights.
- How frequently to re-examine the selection and weighting of securities
A price-weighted index
- The arithmetic mean of the prices of the index securities
- The divisor, which is initially equal to the number of securities in the index, must be adjusted for stock splits and changes in the composition of the index over time.
An equal-weighted index
- is calculated as the arithmetic average return of the index stocks and, for a given time period, would be matched by the returns on a portfolio that had equal dollar amounts invested in each index stock
- assigns the same weight to each of its constituent securities.
A market capitalization-weighted index
- Gives each constituent security a weight equal to its proportion of the total market value of all securities in the index.
- Market capitalization can be adjusted for a security’s market float or free float to reflect the fact that not all outstanding shares are available for purchase
A fundamental-weighted index
uses weights that are independent of security prices, such as company earnings, revenue, assets, or cash flow.
Price-weighted index
= sum of stock prices/number of stocks in index adjust for splits
Market capitalization weighted index
= (current total market value of index stocks/base year total market value of index stock) x base year index value
Equal-weighted index
= (1+ average percentage change in index stocks)x initial index value
Index providers
- Periodically rebalance the weights of the constituent securities.
- This is most important for equal-weighted indexe
Reconstitution
- Refers to changing the securities that are included in an index.
- This is necessary when securities mature or when they no longer have the required characteristics to be included.
Indexes are used for the following purposes
- Reflection of market sentiment.
- Benchmark of manager performance.
- Measure of market return.
- Measure of beta and excess return.
- Model portfolio for index funds.