Die Dis cus si on Pape rs die nen einer mög lichst schnel len Ver brei tung von neue ren For schungs arbei ten des ZEW. Die Bei trä ge lie gen in allei ni ger Ver ant wor tung der Auto ren und stel len nicht not wen di ger wei se die Mei nung des ZEW dar.Dis cus si on Papers are inten ded to make results of ZEW research prompt ly avai la ble to other eco no mists in order to encou ra ge dis cus si on and sug gesti ons for revi si ons. The aut hors are sole ly respon si ble for the con tents which do not neces sa ri ly repre sent the opi ni on of the ZEW.
CO-AUTHORSHIP IN JEEM i
EXECUTIVE SUMMARYSince the first decades of the 20 th century scholarly activity in economics has expanded rapidly. Indeed, the cumulative stock of journal articles in economics has doubled every fourteen years. A century ago, co-authored scientific articles in general and economic papers in particular were, in sharp contrast to the present, more the exception than the rule. A representative example of this, as we will show in this paper, is the evolution in articles published by the Journal of Environmental Economics and Management, which is the leading journal in the field of environmental and resource economics.Numerous empirical studies have examined the production of scientific knowledge in economics, patterns of co-authorship for individual economists, the development of co-authorship in certain economic subfields or, like for most of the studies, the focus was set on the major economic journals. All such studies have found a rising incidence and extent of co-authorship in economic publications. The reasons for this are explored in this paper. However, surprisingly few studies to date have dealt specifically with environmental and resource economics, a subfield which has become ever more important in the economics profession. We hope to close this gap in the research, particularly because of the finding that intellectual collaboration is most important in environmental and resource economics. In this paper, we empirically investigate the first 36 years of the Journal of Environmental Economics and Management. Specifically, we analyze all articles published in this journal with respect to potentially relevant characteristics that could explain an author's decision to cooperate with another peer. We focus in this regard on the development of structural patterns of co-authorship, the increasing complexity of the discussed subject matter, publications by female economists in JEEM, and the incremental growth in international collaboration.Analyses of the structure of co-authorship are normally based on four hypotheses: The division of labor hypothesis, the opportunity cost of time hypothesis, the quality hypothesis, and the diversification hypothesis. We use our dataset to test these hypotheses, also add a fifth hypothesis that is new to the literature: the competition for external funding hypothesis. This hypothesis hinges on the following observation: As research has become more demanding in terms of both skill and financial expense, a...