Should I graduate in 3 years, or have a minor and graduate in 3.5 years?

I’m currently a sophomore with a joint major in Econ/Math. Now I can graduate in 3.5 years.
I can also graduate in 3 years taking a summer, with only this major.
Or I can choose a minor such as business finance and take one more semester but I still have to take a summer.
Or I can choose to study abroad for one year at London School of Economics, which, may be a quite valuable experience. But this way I might graduate in 4 years.
I am so confused right now. Which way should I go by?

A lot of it depends on finances. If you can afford to take al 4 years, the study abroad can be extremely valuable. Ginve that you can graduate early, taking the double major is a viable alternative. It really depends on your priorities.

It depends on how much money you have (or debt you can tolerate), how much studying you’re comfortable with, and how the economy (job market) seems to be going. Also, can the minor be declared and studied toward at the end of your major (when you will know better whether you should do it)?

It also depends on your post-graduation goals, and whether the situation at the end of 3 years is such that you can do them. I.e. assuming you have taken the courses so that you could graduate at the end of 3 years, you may also want to consider whether you have a job or graduate/professional school admission to start right after then.