Sending a paper to a conference with indicating that it is a preliminary version I am a PhD student in economics and I try to finish and send a paper to an international conference but the version that I will send will be a very preliminary version.

I see sometimes in my field that there are papers in which people write under title a little note that the current version is a "Preliminary Version".
I know that most papers sent to conferences are always not complete but I wonder if it is  good to write "Preliminary Version" below the title of the paper.

I ask this question myself because it is sending directly a signal to reviewers and I can not expect how they will react to this note.

Two possibilities : 1) If they like the main idea of the paper, they would be more tolerant for accepting it.

2) They could be more harsh as the author has already wrote on the paper that it is a preliminary version, with thinking that author has not completed it yet.

PS. The papers sent to this conference are blind copies.
In my field (one of the social sciences), where conference papers are usually regarded as work in progress that at a later stage will be send to a journal (as opposed to computer science, where 'publication in a conference' often is the goal), it is not uncommon that people include a statement like "Work in progress, please request most recent version from the authors before citing". I've done that several times, in fact.