Is the growth of multi-authored papers in a field like economics a sign of "increasing cooperation" of economic researchers, or could it be occurring over the past ten years for other reasons? What other signs are out there in the world of peer-reviewed journals of increased cooperation of researchers?
The answer may be yes, but an interesting test will be to do a content analysis of the author affiliations. in general, economics is become increasingly complex in its influences on other sectors of the society and required multidisciplinary collaborations. The increased number of authors might also be indicative of something else such as a norm to co-create research publications.
Multi-authored papers might be due to increasing cooperation but not necessarily always so. Some get authorship as obligatory default. That is why some journals specifically ask about the individual contribution of the authors.
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