I was looking at the vault guide to finance interview from 2005 and I see that:
rf=risk free rate= long term t bond rate= 10%
(rm-rf)=long term risk premium= 8% (I know some say it should be 7% in US market, but in the example they use 8% for some reason)
However, I found that the 10year/30year from Bloomburg to be 3.5%/ 4.375 which is a big difference.
( http://www.bloomberg.com/markets/rates/ )
I am a little confused as to what rf and (rm-rf) are today and would appreciate some help. Do they change?(I thought they might because of a decrease in interest rates) If so, does anybody know what they are today or how I can find/calculate them? I need them to calculate the discount rate in the following equation:
discount rate= rf+beta(rm-rf)
Determining Risk Free Rate
From the Wall Street Oasis Finance Dictionary
The risk free rate is a key concept when valuing potential investments and balancing portfolios. It is simply the current interest rate paid on any investment deemed to be 'risk free' (i.e. US/UK/German government bonds, savings accounts etc.). All other forms of investment should pay a higher interest rate than these, or else it is not worth investing in them for the additional risk taken on.
The risk free rate is used in the Capital Asset Pricing Model to value assets, and all portfolios should contain a certain percentage of money in risk-free assets as a means of diversification
Thoughts from the community on risk free rate.
from certified user @smuguy97
Technically, you should use the 3-month (13 weeks) T-Bill interest rate.
I'm sure Vault is using 10% for simplicity's sake - that would be an insanely high risk-free rate.
1.34% should be fine to use, although for academic purposes I'm sure anything between 1% and 5% is acceptable.
Here's a helpful video from the NYU stern about determining the risk free rate.