103-7 Portfolio Management Theory Flashcards
Modern Portfolio Theory
Developed in 1952 by Harry Markowitz Key point: many investments are required to effectively diversify a portfolio, and that # depends primarily on the correlation between the investments Uses risk (as measured by SD) and expected return as the basis for determining appropriate combinations of assets, or portfolios
Efficient Frontier
This curve represents that set of portfolios that has the maximum rate of return for every given level of risk
Every portfolio residing on the efficient frontier has either a higher rate of return for equal risk or lower risk for an equal rate of return than another portfolio below or underneath the frontier
Indifference Curves
Represent the risk-reward trade-off that the investor is willing to make will cross the efficient frontier in two locations, lie tangent to the efficient frontier, or not intersect the efficient frontier at all
Capital Market Line (CML)
Developed by William Sharpe
Sharpe said it was possible to identify a portfolio on the Markowitz efficient frontier that would be considered the market portfolio (M)
Uses standard deviation as the risk measure along the horizontal (X) axis
Capital Asset Pricing Model (CAPM)
The end result of capital market theory
The CAPM allows the investor to determine an asset’s expected rate of return
2 components:
Stock risk premium: the inducement necessary to entice the individual to invest in a particular tock, whereas the market risk premium is the incentive required for the individual to invest in the securities market in general
Market risk premium: the incentive required for the individual to invest in the securities market in general
CAPM accounts for the impact of systematic risk and does not take into consideration unsystematic risk, which is assumed to have been diversified away
Security Market Line (SML)
Quantifies the risk/return relationship for individual securities (this is the micro evaluation compared to the CML’s macro)
Depicts the relationship of risk and return for individual efficient portfolios and has the same formula as that for the CAPM
Unlike the CML, the SML uses beta as its risk measurement of the horizontal axis
Arbitrage Pricing Theory (APT)
The CAPM explains the returns on stock as a result of only 1 factor: the volatility of a stock relative to the market as a whole (as measured by beta)
Other unanticipated factors are what the APT attempts to quantify
Proponents of APT assert that the expected returns on securities are based on a variety of unexpected or unanticipated factors
Risk-Adjusted Return
A simple risk-adjusted rate of return calculation for a stock or mutual fund using beta is to divide the stock or mutual fund’s nominal rate of return by its beta coefficient
Jensen’s Alpha
A measure of the risk adjusted value added by a portfolio manager
Alpha is measured as the portfolio’s actual or realized return in excess of (or deficient to) the expected return calculated by the capital asset pricing model (CAPM)
Treynor Ratio
Uses beta in its denominator and, therefore, may be used only to compare the performance of diversified portfolios or stocks that constitute diversified portfolios
The higher the Treynor Ratio, the better the risk-adjusted performance of the asset
Sharpe Ratio
Uses standard deviation in its denominator and, therefore, may be used to compare the performance of all portfolios
The Sharpe ratio is a relative performance measure, and the higher the ratio, the better the risk-adjusted performance
Information Ratio
Measures the portfolio’s avg rate of return in excess of a comparison (benchmark) portfolio divided by the standard deviation of the excess return
Should be used only when alpha is positive (i.e., the portfolio manager has added value) and beta is meaningful
Coefficient of Variation (CV)
A computation of the relative measure of total risk (as measured by standard deviation) per unit of expected return and is used to compare investments w/ varying rates of return and standard deviations
When using this ratio to compare two alternatives, the one w/ the lower CV is usually the preferable choice
Be careful not to confuse the coefficient of variation (CV) w/ covariance (COV). CV is a measure of relative risk per unit of expected return, whereas COV is a measure of how returns on assets move together. The former is used as a cross-check on an investment decision, whereas the latter is the basis for optimal portfolio diversification.
Efficient Market Hypothesis (EMH)
Suggests that investors are unable to outperform the market on a consistent basis
Fundamental assumption: current stock prices reflect all available information for a company and that prices rapidly (or immediately) adjust to reflect any new information
Hypothesis is the basis for the buy and hold strategy
Weak Form of EMH
Holds that current stock prices have already incorporated all historical market data and that historical price trends are, therefore, of no value in predicting future price changes
Semistrong Form
Holds that current stock prices not only reflect all historical price data but also reflect data from analyzing financial statements, industry, or current economic outlook