Hi, I think there is a mistake while calculating the price elasticity for both own and cross elasticity, you choose beta 5 which is -1.09 calculated from the previous model instead of using the new one which is -0.44.
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thanks for reaching out! The price elasticity used to compute the cross elasticity still uses the beta for the own brand. For further details you can consult the derivation file which you can download from this lesson:
If there's anything else unclear, do not hesitate to write to us.