
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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