Design Salary Structure Using Exponential Regression

How you decide to use the Exponential Regression but not Linear Regression, is there any theory behind this?

Hello!  I love your videos, they are very helpful!  Is there a way to access the three part series you did on Designing Salary Structure using regression analysis?  I can't seem to locate the videos previous to this one.  Thank you!

I couldn't find the files of designing salary structure using the Regression Analysis part 1,2 and 3 ?