Heterogeneity of Investors and Asset Pricing in a Risk-Value World



c(ε)


+


-Vi/fi (⅛)

∑j . s-~r⅛ffj(


7~ιΛa + e) 1[i+v(е)]vε
7 - 1    1 - 7/

(38)


with V(ε) being defined in equation (20). The latter follows from f (e⅛)/-

V = (ɛie)/ — Vi — sι + sii ^i∙ This proves the first part of equation (21).

Now we we prove the second part of equation (21). Substitute f z(⅛) / f (⅛)
in equation (31) from (33) and multiply the equation by i + e/(1 - 7))

This yields

7 - 2 de-ι

7 - 1 dε


λ + '■ "/0 - 7) d = c(ε) (λ, + -ɪ
deidε      dε- у      1 - 7


i, ε∙


(39)


The factor of d2ei/de2 equals the inverse first term in equation (36). Hence
it follows from equation (36) and (15) that this factor equals

fi (eis')

(40)


-V

Insert (40) in (39) and obtain after aggregation across investors since
i d2ei/de2 = 0,

72 + Σ -4τd2edε2 = c(ε) fA + γ-e^^ ( ε (41)

7- 1 t ^)               V    1 - 7 J

44



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