[marketforlemmas]

Does SSRN come with any guarantee of peer review or minimum quality threshold? The only downside with arXiv is that anything can be posted. It works fine as a paper-hosting service but is terrible as a "social proof that my paper is OK". If SSRN comes along with such a reputation, then it might be a hard transition.

However if SSRN is just a paper-hosting service, then everyone should move to the arXiv immediately.

[1hackaday]

SSRN posts anything (no peer review). It has the same function as arXiv.

The only issue I see with moving to arXiv right now is that currently arXiv only accepts papers on topics such as physics, math, and CS. For arXiv to be helpful to the SSRN crowd, it would need to have a few new categories (e.g., "quantitative social science", which could be split into subtopics mirroring the main topics in economics and management science journals).