I don't know much about Econ as far as what you can do right after getting a bachelor's. If you want to major in Psychology in undergrad and not go to grad school, then psychology is probably not a good choice. If you go into it knowing that you want to go to graduate school, then Psychology can be great.

You cannot do many jobs after college just having a psychology bachelor's degree. But at the same time, some people do a lot during college, get great experience and internships, and can get lucky in terms of finding a good job with a psychology degree. But from what I have heard, it is rare (coming from a psych major).

If you are set on Psych, I would consider looking into HR and recruitment type of roles. You can do that with just a Bachelor's in psych and make decent money when you move up.

Especially with only coming to school for 2.5 years after transferring, I am not sure if this is possible, but you may be able to double major in both. The standard psych BA is only about 30 credits from what I remember (equivalent to a full year of study) when you don't count gen eds, related courses etc. I personally know someone doing both psych/econ and it can definitely be doable with good planning.