Downside to not Double Majoring? (Target)

Hello,

I have used the search engine feature and am aware of how it is not necessary to double major if one is from a target school.

However, I was curious as to what the missed out potential, in terms of pay, could be from this for a non-quant? In particular, I am an Economics major, and am considering to pick up a Math/Stats/CompSci Major. I do not really have a preference for any of the three and am actually a bit hesitant to pick up a double major because these three departments are the most rigorous ones at my school, so I don't want to potentially hurt my GPA and not have time to network / enjoy life. Am I correct in attempting to secure the GPA > Double Major route?

Additionally, is there any other double major possibilities that can be beneficial if pursued?

Thank you