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Price=Earnings at t=1*(1-Earnings Retention ratio)/(CAPM-ROE*Earnings retention Ratio)

the same as

Price=Earnings at t=0*(1+ROE*Earning retention Ratio)*(1-Earnings retention Ratio)/(CAPM-ROE*Earnings Retention Ratio)


Price/Earnings at t=1 =(1-Earnings Retention Ratio)/(CAPM-ROE*Earnings retention Ratio)

I used the simple CAPM as a arbituary measure of required return. There are many many others.

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