Job Market paper: what are the criteria? I am going to apply for a Post-Doc position, in Business Economics. One of the required application documents is a "job market paper". I have searched about what a job market paper is and specially there is a good post here Clarification needed: Job Market Paper. 

However, I could not find any answer or hint to resolve my current problem. Concisely, I have written 3 papers for my PhD thesis, and these papers are closely-related to each other, such that the second one is based on the first, and the third is based on the first and second. Now, I don't know how to choose one among them.
While the first paper is for broader audience than the second one, the latter has higher quality and more significant contribution to the field, in my opinion. However, this second paper, which has higher quality, is very difficult to be understood for broad audience. On the other hand, the first paper is a good showcase -show off indeed!- of my quantitative skills and interdisciplinary knowledge of economics and machine-learning. 

May someone please help me to choose between these two? Shall I consider the broader audience and less contribution, or high contribution on a very niche sub-field? 

P.S: None of the papers has been published yet.
I agree with @AlexanderWoo--ask people in the field that you know.  However, this also seems like a situation in which it might be useful to construct a new paper that combines material from the first and second paper.  Don't make it too long, though, and get people in your field to give you feedback before sending it, if possible.  

You also might want to use different papers for different applications.  Think of this as a an addendum to the answer you referenced.  If you're applying for a postdoc, is it a postdoc with someone who is working on similarly technical material, with a lot in common with your research?  Or are they hiring a postdoc because they lack expertise in your area and need someone in that area as a collaborator?  If you think that the people likely to evaluate your application are capable of understanding paper 2 on its own, then maybe you should send it.  If not, maybe it would be better to send paper 1, or the hybrid paper I suggested.