First: Ask your econ PhD colleague for some basic buzzwords and sentences.
Second: Let her do most of the talking.
Third: Bombard people with your bizarre work history so that they would rather talk about funeral homes and reservations than economics.
It seemed to work out okay for me. I fooled everyone (except one guy, but that’s because I told him I wasn’t an economist). I think I even fooled our co-founder, Alex. Time will tell. If I’m doing good work, it shouldn’t matter. Right?