Ferdogan wrote:
>
> Hi,
>
> I have two products which are substitudes. I try to fix a system as below
> to mydata.
>
> Demand1 = A1 -B1*Price1 + C1*Price2
> Demand2 = A2 +B2*Price1 - C2*Price2
>
> I would expect C1 & B2 to be symmetric, If they are truly substitude. How
> can I enforce this symmetry when creating a system of equations via
> SystemFit ?
>
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