In: Finance
The Chahad Bank wants to open a new branch in a distant city with very different economic conditions. Currently, the bank has an expected return of 15% with a standard deviation of 7%. The new branch is expected to have a return of 20% with a standard deviation of 10%. The correlation between the bank's returns and the returns from the new branch is -0.3. The new branch is expected to contribute 10% of the bank's revenues. What is the expected return for the bank if they add the new branch?
Portfolio SD:
It is nothing but volataility of Portfolio. It is calculated
based on three factors. They are
a. weights of Individual assets in portfolio
b. Volatality of individual assets in portfolio
c. Correlation betwen individual assets in portfolio.
If correlation = +1, portfolio SD is weighted avg of individual
Asset's SD in portfolio. We can't reduce the SD through
diversification.
If Correlation = -1, we casn reduce the SD to Sero, by investing at
propoer weights.
If correlation > -1 but <1, We can reduce the SD, n=but it
will not become Zero.
Wa = Weight of A
Wb = Weigh of B
SDa = SD of A
Assume A = Old Business
b = Additional business.
SDb = SD of B
Particulars | Amount |
Weight in A | 0.9000 |
Weight in B | 0.1000 |
SD of A | 7.00% |
SD of B | 10.00% |
r(A,B) | -0.3 |
Portfolio SD =
SQRT[((Wa*SDa)^2)+((Wb*SDb)^2)+2*(wa*SDa)*(Wb*SDb)*r(A,B)]
=SQRT[((0.9*0.07)^2)+((0.1*0.1)^2)+2*(0.9*0.07)*(0.1*0.1)*-0.3]
=SQRT[((0.063)^2)+((0.01)^2)+2*(0.063)*(0.01)*-0.3]
=SQRT[0.0037]
= 0.0608
= I.e 6.08 %
SD of Business along with new branch is 6.08%