This is not true. I've been through an economics program and a lot of theories have empirical data to support them. Of course it's much harder to prove there is causation and not only correlation (and all that that entails), but that's part of being a topic which to a large extent deal with social phenomena (people).
Can't dig up anything now but a lot of phenomena in papers (though of course far from all /majority) do or reference some sort of quantitative research).
Can't dig up anything now but a lot of phenomena in papers (though of course far from all /majority) do or reference some sort of quantitative research).