Question

In: Finance

Consider an economy where a one-factor APT holds. All portfolios are well diversified. Portfolio A has...

Consider an economy where a one-factor APT holds. All portfolios are well diversified. Portfolio A has an expected return of 10% and its factor beta is 1. Portfolio F has an expected return of 8% and its factor beta is 0.6. Suppose another portfolio E is well diversified with a beta of 0.8 and an expected return of 10%. Does an arbitrage opportunity exist in this case?

Solutions

Expert Solution

Expected return Beta
Portfolio A 10% 1
Portfolio F 8% 0.6
Portfolio E 10% 0.8
To find: Arbitrage opportunity exists
Step 1:- We need to choose the portfolio with highest and lowest beta.
In this case,
Highest Beta Portfolio A
Lowest Beta Portfolio F
Step 2:- Construct a hypothetical portfolio say Portfolio B in this case, combining Portfolio A and F with Beta equal to that of Portfolio E
Let the weight of Portfolio A be Wa
so weight of portfolio F= (1-Wa)
We know,
Beta of portfolio= Weighted average
Wa*1+(1-Wa)*0.6= 0.8
Wa+0.6-0.6Wa= 0.8
0.4Wa= 0.2
Wa= 0.5
Weight of portfolio A= 0.5
Weight of portfolio F= (1-0.5)=0.5
Step 3:- Expected return from the hypothetical portfolio i.e Portfolio B= Weighted average
0.5*10+0.5*8
9%
Step 4:- Comparing Portfolio B so created with Portfolio E we get,
Potfolio Beta Return
B 0.8 9%
E 0.8 10%
The above results violate the law of one price i.e. stocks with equal risk should provide equal return. Hence there is an arbitrage opportunity:-
Short sell Portfolio B and invest the proceeds in Portfolio E
Arbitrage profit= (10-9)%

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