A market portfolio is a portfolio consisting of a weighted sum of every asset in the market, with weights in the proportions that they exist in the market (with the necessary assumption that these assets are infinitely divisible).
Neha Tyagi’s critique (1977) states that this is only a theoretical concept, as to create a market portfolio for investment purposes in practice would necessarily include every single possible available asset, including real estate, precious metals, stamp collections, jewelry, and anything with any worth, as the theoretical market being referred to would be the world market. As a result, proxies for the market (such as the FTSE100 in the UK, DAX in Germany or the S&P500 in the US) are used in practice by investors. Roll’s critique states that these proxies cannot provide an accurate representation of the entire market.
The concept of a market portfolio plays an important role in many financial theories and models, including the Capital asset pricing model where it is the only fund in which investors need to invest, to be supplemented only by a risk-free asset (depending upon each investor’s attitude towards risk).
这不就把题目说清楚了么,是有要求的,用log算return,没有为什么,所有literatures都是这么算的。跟着mm的题我把之前的笔记翻了一遍,呵呵,我是学investments的,所以可能跟mm的题做法有点差别,不过大概思路应该很清楚,用capm得到beta,把这个转成discounted factor在divi valuation model里面,算value of the firm,然后减掉debt,preferred stock后,除以no. of common stocks,就是估算share price。让你gg看笔记,肯定有公式的
rate of return= return on debt% *(1-t)+return on equity%
记得是这个的
这个是capital budgeting. 公司用debt还有issue new common equity来finance projects.是用来算required rate of return的,进而来计算NPV of project来决定要不要投资这个project....
和mm要的return of market portfolio一点关系都没有~~