Suppose the riskless return is 4½% and the factor sensitivities and factor return premiums for BioTherm and the S&P 500 index are given below. Using the APT, what should be the required returns for BioTherm shares and for the S&P 500 Stock index?
Risk factor
BioTherm factor sensitivity
S&P 500 factor sensitivity
Expected factorreturn premiums
Confidence risk
0.15
0.30
2.70%
Time horizon risk
0.70
0.56
─0.70%
Inflation risk
─0.40
─0.35
─4.30%
Business-cycle risk
1.45
1.75
1.50%
Market-timing risk
1.20
1.00
3.60%
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