this paper reports on the results of a research carried out during 1993-94 aiming at studying street sellers as an informal sector activity and a source of socio-economic problems in shiraz, iran. this study makes use of two logit models in order to present a unified framework depiciting the factors that seem to affect the developmeht of informal sector activities. the first model looks at thos...

In writing Verbal Behavior, B. F. Skinner (1957) made clear his intention not to review the extant literature on the subject matter (Skinner, 1979, p. 282). Nonetheless, he did formally and informally cite many scientific, philosophical, and literary books and articles throughout his text. The formal citations appear as references in footnotes at the bottoms of pages, but are not found in any r...