without getting too deep into "field purity" [0], it's certainly a field of study insofar as game theory, psychology, anthropology, etc. are fields of study. It's possible to make certain models of behavior or outcome potentials, but running experiments is significantly more difficult than e.g. physics or biology.
So it's science inasmuch as anything with n=1 repeatability can be science
So it's science inasmuch as anything with n=1 repeatability can be science
[0]: https://xkcd.com/435/