Independent solution

How to solve this Immunization and Asset-Liability Management question

Setup

Setup

With zero-coupon bonds, each liability date is matched independently by the bond maturing on that date.

It=1000(1+st)tI_t=\frac{1000}{(1+s_t)^t}

Model

Model

Only the one- and three-year investments are needed for the requested difference.

I1=10001.08=925.925926I_1=\frac{1000}{1.08}=925.925926
I3=1000(1.10)3=751.314801I_3=\frac{1000}{(1.10)^3}=751.314801

Compute

Compute

Subtracting the two required present investments gives 174.61.

I1I3=174.611125I_1-I_3=174.611125

Answer

Answer

The one-year bond investment exceeds the three-year investment by about 175, selecting choice E.

I1I3175(E)\boxed{I_1-I_3\approx175\quad\text{(E)}}