Tam Phan replied to Maarten Buis:
> In the mean time, How do you feel about this proposal:
>
> Y1=a1+b1(price)+e
> Y2=a2+b2(price)+v
>
> the aggregate would be Y1+Y2= (a1+a2) +(b1+b2)(price)
-sureg-?
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Clive Nicholas
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