Questions tagged [capm]

The capital asset pricing model is a model that allows to determine the theoretical rate of asset returns required by an investor, given the asset systematic risk or market risk.

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How to scale t-bond yield movements on a chart to visualize its relative impact to the pricing of other assets?

How does one scale the 10yr yield on a chart to visualize its relative impact to asset valuations? I.e., so that the risk-free rate moving from 1->2% shows as a much larger movement than 11->12%....
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CAPM estimation model alternatives

Let's take a look at the standard CAPM: $$ r_{i} -r_F = \alpha+\beta(r_{MKT}-r_F) + \varepsilon $$ I would like to consider the alternative formulation: $$ r_{i} = \alpha+\beta(r_{MKT}-r_F) + \...
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Why weigh assets by market values in CAPM?

Can anyone help me understand as to why in CAPM's market portfolio investors will always have the assets in proportion to the market value? One of the intuitive reasonings that I have read explains ...
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Betas and weighted average ERP

Whenever analyzing a particular company through CAPM, I used to take the Equity Risk Premium (ERP) of the country where the company was listed/headquartered. However, recently I came to know that some ...
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Are there optimal portfolio theories than instead of the expected value they were based on the Mode of distributions

Are there optimal portfolio theories than instead of the expected value they were based on the Mode of distributions? During my engineer student days I saw the Markowitz theory for portfolio selection ...
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Which investment do you choose? Same expected return but differing variances and correlation [closed]

Let's say you have two investments, A and B. Both A and B have the same expected return. However A has low variance and is not correlated with any other investments. Whereas B has high variance and ...
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Part of return on asset uncorrelated with market

I've been told (and have done problems) involving the part of the return of an asset $X$ that is uncorrelated with returns on the market $M$, which can be written as $X - \beta X$. This sort of makes ...
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CAPM and Beta under Prospect Theory

I'm thinking about some sort of behavioral risk factors such as whether different utility functions, such as Prospect Theory according to Kahneman and Tversky, might change the way betas are derived ...
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utility function and CAPM in portfolio theory

I am trying to connect some dots in my understanding between 2 concepts. Utility function: I can see there there are different utility functions and I can draw them at different levels until I find ...
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Why is the tangency portfolio the market portfolio? [closed]

Except for the fact that in equilibrium demand must equal supply, I do not understand why, by chance, this tangency portfolio is the market portfolio. Do you have any idea?
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Questions about Merton's derivation of the security market line

In Merton's "An Analytic Derivation of the Efficient Frontier" (PDF), he derives the security market line for the CAPM using the definition of the tangency portfolio. He writes: Here, $m$ ...
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Deriving the CAPM from the CML

In the paper "A Simple Derivation of the Capital Asset Pricing Model from the Capital Market Line" the authors reason: Given the CML $$R_p = R_f +\frac{R_m - R_f}{\sigma_m}\sigma_p$$ where: ...
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Can I invest in the market portfolio of modern portfolio theory? [closed]

According to the theory, the market portfolio is composed of all assets weighted by their market capitalization, and this is the portfolio one should own. Is there a way to build a portfolio close to ...
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If CAPM holds, should alpha be zero for all assets?

If CAPM holds, should alpha be zero for all assets?
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Why is it that returns at the efficient market hypothesis has to be risk-adjusted?

Let us assume the following situation: Average market return: $R_M = 8\%$ Risk-free rate: $R_F = 2\%$ Actual return of share A after one year: $R_{A} = 15\%$ Actual return of share B after one year: $...
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Why additivity assumption holds in CAPM and factor models? (Screenshot of a textbook included) [closed]

All the excerpts are from the book investment, written by Bodie. At the bottom of this post, I attached pages of the the book that show a related part of my question. Question 1. Why the variance of ...
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In-sample forecast accuracy of Beta (Kalman filter) CAPM

One can calculate time-varying betas (known from the CAPM) using the Kalman filter. For example, one can calculate the in-sample forecast accuracy using the MAE. $MAE = \frac{1}{T}\sum_{t=1}^T|\hat{R}...
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Geometry of Efficient Frontier of Portfolios

I have been reading about Portfolio Theory, and though the algebra of it seems quite intuitive, I am having a hard time understanding it's geometry. For the sake of simplicity, I will only talk about ...
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What is the relation between "Capital Market Line" and "Capital Asset Pricing Model (CAPM)"?

I asked this question on Personal Finance and Money but since I don't know where to place it I placed it here also. On the Coursera course Portfolio and Risk Management, on Week 2, I am having trouble ...
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Construct portfolio with assets having expected negative returns

I have been asked to select a n stocks among N stocks, to construct a portfolio. Some of them have have negative weekly returns on average. If I want to select these n stocks by constructing an '...
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Black-Litterman Weights Don't Change for Assets Without Views

I am using Idzorek 2002 (https://faculty.fuqua.duke.edu/~charvey/Teaching/BA453_2006/Idzorek_onBL.pdf) as a reference to implement the BL model in R. I have specified the model in its standard form, ...
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Dividend Discount Model for a stock and its derivatives

This might be a bit basic but I've found this question and I'm definitely over-thinking it and now I've just completely confused myself. I'm just looking for some clarification. I've been given the ...
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Time horizon of estimation period CAPM beta

When calculating CAPM beta, it is done by rolling regressions. If it is only the beta we want to obtain, am I correct to assume that we can estimate rolling correlations and stds, and use this to ...
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How do I have to calculate the risk free rate of my two asset portfolio?

Good afternoon everyone! I have a question regarding the risk free rate of my two asset portfolio. For my course, we have to create a two asset portfolio with the time frame of 2015-2020 with monthly ...
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How to reconcile CAPM with Discounted Cash Flows valuation?

According to CAPM (in its most basic form) our asset allocation will only depend on the expected returns and the covariance matrix of returns. If we also consider the risk-free asset and assume that ...
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CAPM: Testing for alphas jointly equal to zero

For my project, I need to assess if a certain factor X leads to a CAPM-Anomaly. First, I sorted the monthly stock return (sample size: 500+ observations) according to the X factor in 10 decile ...
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Some basic questions using consumption CAPM

Say we are in a world described by the consumption CAPM. All investors in this world have quadratic utility. Also, assume that consumption is as follows: $$c_{t+1} = (1+m_t)c_t + s_t c_t e_{t+1} $$ ...
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CAPM alphas have unexpected p-value distribution

I am trying to "test" whether the EMH holds by testing for every stock in the S&P 500 whether it has a "significant" CAPM alpha. If the EMH is true, then the null-hypothesis (...
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Multiple Indices for CAPM model [closed]

I am new to quantitative finance so, please excuse me if the terms are not correct. I am trying to apply CAPM on a portfolio which has multiple indices (S&P 500, Russel 1000 and S&P Financials)...
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Deriving the tangency portfolio with a condition in Python

If there are sister-sites better suited for this question please let me know, I thought this to be the most fitting I have the covariance matrix, the return vector and some scores (ESG scores). The ...
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Alpha - Time Series vs Cross Section Approach

I am currently reading Cochranes book on asset pricing. However, I get confused about one thing. He says that one could test a factor model (I will use the CAPM, just as he does), via a time series ...
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Calculate weight of an asset

Suppose there are three assets, and the first asset has volatility 18%, the second asset has volatility 16%, and the third asset has volatility 16%. Suppose also that the first two assets' returns ...
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What mechanisms does the market use to brining an asset back to the market line, as defined by CAPM?

The Capital Asset Pricing Model (CAPM) model states that, on efficient market, expected return of an asset should be given by a linear function of its volatility (as measure by standard deviation of ...
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Which risk-free rate to use for the UK?

I am working on an assignment to calculate Beta in the CAPM Model through empirical data on the british market and am still unsure which risk-free rate to use. Since I have a 1 week investment horizon,...
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Build a portfolio with $\beta=1$ and minimize $\sigma^2$ using CAPM

Suppose there are two stocks A and B: expected returns are $E[R_A]=0.1$, $E[R_B]=0.15$; standard deviations are $\sigma_A=0.1$, $\sigma_A=0.2$; correlation is $corr(A,B)=0.6$; their betas to some ...
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linear stochastic discount factor

I have heard some people say something like the following with regards to APT: Let returns be given by the factor model $r_t = B_tf_t + e$ with $E(f_t) = \lambda_t$ Assume that factors are ...
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Is market price of risk always negative?

I might have a gap in understanding, so clarifying: Basic pricing equation $E(R) = - cov(m, R)$ where $R$ = excess return and $m$ = stochastic discount factor (I think this is continuous case, in ...
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Nonsystematic risk in a random rate of return [closed]

Good evening, I am studying the CAPM and I have a doubt regarding the variance $σ_i^2$ of the expected return of an asset $i$. In particular, how can I derive the following formula? $$σ_i^2 = β_i^2 ...
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Event study using sector indices

Analyzing Covid-19's impact on different sectors I would like to use sector indices. Can you use CAPM or similar to calculate abnormal returns of indices or does it only work with stock prices?
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Inverse Covariance Matrix Transformation from CAPM

Beginning with the CAPM model we have (with a risk free rate of 0%): $r_i=\beta_i (r_m)+\varepsilon_i$ with $\varepsilon_i$ the diversifiable risks per assets The variance matrix: $\Omega = \beta'\...
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Arbitrage in a Single Index Model

Simple question really, but I'm very confused by the starting point. Let's assume that we have a portfolio whose excess returns can be described by the following equation from the single index model: ...
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2 votes
1 answer
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Assumptions of the CAPM

As to my understanding, the CAPM assumes that all investors behave as described in the portfolio theory. Consequently, all investors hold a combination of the risk-free investment and the efficient ...
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Relation between CAPM and Portfolio Theory

can any of you explain to me in simple terms how CAPM and portfolio theory are related to each other? To my understanding: Portfolio theory helps to select the "right" stocks under risk/...
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How can beta be negative? [closed]

I've been reading about the security market line and the definition of beta as $$\beta_i = \frac{Cov(R_i, R_m)}{Var(R_m)} $$ for any asset (doesn't have to be an efficient portfolio), and have read ...
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Risk free rate's role in CAPM

I don't understand what is the mathematical and financial role of risk free rate in the CAPM formula . Why do we need to add 10 years treasury yield to the formula then substract it again from the ...
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How is CAPM used to price an asset once it has been used to derive the assets expected return?

As I understand it (correct me if I'm wrong) the theoretical price of an asset should be the present value of all future cash-flows that it is expected to yield, discounted at the risk-free rate. I am ...
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Low volatility in factor regression

Let's say we are working with the standard Fama-French 3 factor model and we want to add a low volatility factor. Is it alright to add a low volatility risk premium in a model such as the CAPM or FF3. ...
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2 votes
2 answers
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Cashflow Risk vs Discount Risk

Studying asset pricing, I often hear the terms cashflow risk and discount risk but I'm not sure what they mean? The Campbell/Shiller (1988) decomposition includes cashflows (future dividends) and ...
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Why is the efficient portfolio assumption necessary for the CAPM model?

One of the main assumption in the CAPM model is that all the investors are rational and they hold the most efficient portfolio for a given level of risk. What difference does this assumption make? ...
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Adding more factors to Fama French Carhart 4 factor model

Does it make sense to add more factors such as Quality Minus Junk (QMJ) and Betting Against Beta (BAB) in the Fama-French-Carhart model? Also, if anyone can point me to an article it would be ...
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