Though a truly risk-free asset exists only in theory, in practice most professionals and academics use short-dated government bonds of the currency in question. For US Dollar investments, US Treasury bills are used, while a common choice for EURO investments are the German government bonds or Euribor rates. The risk-free interest rate for the Indian Rupee for Indian investors would be the yield on Indian government bonds denominated in Indian Rupee of appropriate maturity. These securities are considered to be risk-free because the likelihood of governments defaulting is extremely low and because the short maturity of the bills protect investors from interest-rate risk that is present in all fixed rate bonds (if interest rates go up soon after a bond is purchased, the investor misses out on the this amount of interest, till the bond matures and the amount received on maturity can be reinvested at the new interest rate).
Though Indian government bond is a riskless security per se, a foreign investor may look at the India’s sovereign risk which would represent some risk. As India’s sovereign rating is not the highest (please search the internet for sovereign ratings of India and other countries) a foreign investor may consider investing in Indian government bonds as not a risk free investment.
For valuing Indian equities, we will take 10-Yr Government Bond as risk-free interest rate. (Roughly 7.8% - as of this writing).
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