I recently received comments from the reviewers on my research paper. In my paper I look at the impact of X on Y and find that X negatively affects Y. One reviewer has commented that while my findings are interesting, they are uncomfortable with the idea because of existing literature that has found Y negatively affects X. In my literature review I have briefly discussed the literature on Y->X before moving on to the literature on X->Y (which is my focus). However, I am unable to understand how to respond to their comment that they are uncomfortable with my finding as a strand of literature has discussed a contrasting position.
Would appreciate any help. I'm in Economics, if it matters.