Some conferences ask for an extended abstract. What are the differences among "abstracts," "extended abstracts," and "full papers?"
My view is that in economics an extended abstract is a short version of the paper. Conferences that accept extended abstracts usually expect them to include results, methodology and a short discussion, to be able to gauge the plausibility of findings and appropriateness of the methodology.
In terms of lengths, I'd say 2-6 pages, while a full paper is anything from 15 to 100 pages. So, while very different in terms of length, the main contributions in the paper should be found in the extended abstract.