Answer: E. a reduction in the risk-free rate
Step-by-step explanation:
The Security Market Line approach uses the Capital Asset Pricing Model to calculate the Cost of Equity.
CAPM formula is depicted as follows,
Ce = rF + b(rM - rF)
Where,
Ce is Cost of equity,
rF is Risk free rate of return,
b is Beta,
rM is the market rate of return
(rM - rF) is the market premium
Looking at this formula, one can deduce that if the risk free rate were to reduce, the beta would be multiplying a higher Market Premium because the reduction from the market rate return by the Risk free rate would be lesser.
For example.
Assuming rF is originally 4% and b is 2 and market return is 10%.
The cost of equity would be,
= 4% + 2 ( 10% - 4% )
= 4% + 2 ( 6%)
= 16%
Now assuming that the risk free rate dropped to 3%. The cost of equity will become,
= 3% + 2 (10% - 3% )
= 3% + 2 (7%)
= 17%.
Notice that the Cost of capital increased to 17% when the risk free rate dropped to 3%.
This means that option E is correct.