Posting a paper on a preprint repository (SSRN) before publishing (economics)? I am a young scholar and I have a paper that is virtually finished. I was thinking about posting it as a working paper on SSRN to get more feedback and comments. However, I worry if it will be still possible to submit it to a journal. 

After a search on an internet, I found that people from various fields disagree on this and I am not sure how it goes in economics. I am especially confused because my paper is almost finished, but I worry I might have overlooked something, but it is also possible that the final version will not differ at much. Thanks in advance for any useful advice.
The disagreement is not merely between fields, but even between journals in the same field, published by the same organization!

For example, the American Chemistry Society (ACS) recently launched ChemRxiv as the chemistry counterpart to arXiv.org in physics. However, as of the launch date, only The Journal of Physical Chemistry series of ACS allowed authors to submit to the preprint server.

So, you need to check with the requirements and rules of the journal to which you want to send the paper to determine what is permissible.

In any event, though, if you can't submit the paper to a preprint archive, you could distribute it to trusted colleagues for feedback before submission!