I am new to this forum and would like some help with the interpretation of the following regression. I hope I am in the right place.

lnWaste = +A(lnGDP) +B(lnGDP)2

I have found coefficients for lnGDP= -1.85 and for (lnGDP)2=0.1

Now I am trying to give an interpretation of what would happen to Waste if GDP increases by x%.

I usually report the elasticity easily but I am not sure how to work with this since I have two different values that I should take into account when differentiating. I hope this makes sense and someone can give me a hand.

Many thanks to all!