Standing on the shoulder of giants: the aspect of free-riding in RePEc rankings

Research papers in economics (RePEc) rankings have become a well-established source of information about actual and perceived academic performance of institutions, academic fields and their authors. One essential ingredient is the impact factors calculated in RePEc which differ from the standard ones. RePEc reports the ratio of the cumulative citations of all articles of a journal and the number of listed items. The continuously updated RePEc impact factors account for the whole journal and citation history. This approach gives rise to a potential free-riding of authors who profit from journal ranking established in the past. In this article, we demonstrate how the rankings of economists change if one calculates yearly impact factors. The distribution of gains and losses is most pronounced among middle-field ranked authors while the top group shows relative persistence.     

Incorporating research findings in the economics syllabus: evidence on genuine sociality from Italy and the UK

Economics education is proving slow in incorporating into the syllabus the genuine advances made in economics research in the last few decades. As economics education relies primarily on the single approach of neoclassical economics, whilst recent advances in research have been marked by a wide variety of approaches, many of which are interdisciplinary, the methodological divide between education and research is growing wider. We attempt to measure how keen students are to incorporate research findings in the syllabus by developing a questionnaire which introduces undergraduate students in Italy and the U.K. to key findings in the research literature on genuine sociality, an area in which the methodological divide is very noticeable. Students display moderate support for being taught the material on genuine sociality. Students who wish to incorporate genuine sociality in the syllabus tend to be older, value virtue and have a religion.     

Water markets design and evidence from experimental economics

Market mechanisms are gaining increasing acceptance all over the world as a way of making more efficient use of scarce water resources. Designing regulatory frameworks that ensure both inter- and intra-temporal efficient allocations is a daunting task, especially if supply is stochastic and there is ample storage capacity. In addition to defining tradable rights, specific provisions must regulate the use of reservoirs. Commonly, water statutes include provisions that establish asymmetries regarding the allocation of water, and market restrictions that ban water trading across different users. In this article, we use data collected in a laboratory to test two specific market regulations included in the 1999 Water reform in Spain. First, junior right holders are not allowed to buy water from senior users. Second, the law does not explicitly define water rights over units left in reservoirs for the following season. Results suggest that trading restrictions among water right holders lead to welfare losses for senior users. It is shown that removing this restriction would increase senior right holders’ benefits, without reducing those of junior users. Results show that defining water rights over saved units across periods would increase the average stock levels of reservoirs, and reduce market price instability. The lessons learned from the Spanish experience are applicable to settings characterized by unstable natural water supply and the availability of large storage facilities.      

Citations,journal ranking and multiple authorships reconsidered: evidence from almost one million articles

In this article, we reconsider the investigation by Moosa (2016) using a much larger data set of almost one million articles listed in Research Papers in Economics. This article provides new insights into the effects of co-authorship on citation counts and the correlation between quality of papers and quality of the publishing journal. Our evidence is partially in contrast to the results reported in Moosa (2016). We find a positive correlation between the h-index of a journal and the quality of papers measured in terms of citations. This correlation becomes almost perfect using a nonlinear model. Results from a regression of citation counts on the number of authors show evidence of a positive and significant effect of co-authorship on the quality of a paper when time effects and large sets of top-cited articles are taken into account. The inclusion of time effects and the large data set, that allows to differentiate between top-cited cohorts, adds further insights to the existing literature.     

Patterns of co-authorship among economics departments in the USA

Given the steady increase in co-authored papers in economics journals, this paper reports a study of the patterns of co-authorship between US universities and colleges. A majority of institutions produce more co-authored than single-authored papers. Contacts with researchers from the same institution are still an important source of co-authored papers, even though slightly decreasing in frequency. The determinants of co-authorship outside the own institution are tested in a gravity model and it is found that distance and other geographical variables do not matter. However, the quality of co-authors' institutions, measured by rankings of institutions, has a significant impact on the number of co-authored papers in top economics journals.     

Recent trends in brand-name and generic drug competition

Objective:

To provide evidence on recent trends in: (1) market exclusivity periods (MEPs, the time between launch of a brand-name drug and its first generic competitor) for new molecular entities (NMEs); (2) the likelihood and timing of patent challenges under Paragraph IV of the Hatch-Waxman Act; and (3) generic drug penetration.

Methods:

IMS Health National Sales Perspectives data were used to calculate MEPs for the 257 NMEs experiencing initial generic entry between January 1995 and September 2012 and the number of generic competitors for 12 months afterwards, by level of annual sales prior to generic entry and time period. The likelihood and timing of Paragraph IV challenge were calculated using data from Abbreviated New Drug Approval (ANDA) approval letters, the FDA website, and public information searches to identify drugs experiencing Paragraph IV filings, and the first filing date.

Results:

For drugs experiencing initial generic entry in 2011–2012, the MEP was 12.6 years for drugs with sales greater than $100 million (in 2008 dollars) in the year prior to generic entry, 12.9 years overall. After generic entry, the brand rapidly lost sales, with average brand unit share of 16% at 1 year; 11% for NMEs with pre-generic entry sales of at least $250 million (in 2008 dollars). Over 80% of NMEs experiencing 2011–2012 initial generic entry had faced at least one Paragraph IV challenge from a generic manufacturer. These challenges were filed relatively early in the brand-name drug life cycle: within 7 years after brand launch, on average.

Limitations:

Analyses, including Paragraph IV calculations, were restricted to NMEs where generic entry had occurred.

Conclusion:

Pharmaceutical competition continues to evolve; while the average MEP below 13 years for 2011–2012 remains consistent with prior research, Paragraph IV challenges are increasingly frequent and occur earlier, and generic share erosion has intensified.     

Community college economics instruction: Results from a National Science Foundation Project

The principal investigator of a National Science Foundation project, “Economics at Community Colleges,” surveyed community college economics faculty and organized workshops, webinars, and regional meetings to address community college faculty isolation from new ideas in economics and economics instruction. Survey results, combined with National Study of Postsecondary Faculty data, help fill a lacuna in information about community college faculty. A key finding is the reliance in community college economic instruction on part-time faculty, including many who do not hold a graduate degree in economics. The project's webinars reached the most community college faculty, while the workshops were most effective in improving economics instruction. Areas for future research are identified.     

Co-authorship and research productivity in economics: Assessing the assortative matching hypothesis

This paper estimates the relation between the size and quality of scientists’ co-author networks and individual characteristics (notably productivity) in the context of institutional changes in French academia in the mid-1980s. The analysis employs the Two-Stage Residual Inclusion (2SRI) framework to handle endogeneity in individual productivity relative to the quality of co-authors. The main finding is that the size and quality of authors’ networks are positively related to their productivity; this is understood as evidence of assortative matching. Other effects on co-author networks (such as life-cycles, specialties fields) are also identified. Our results have important policy implications as it indirectly demonstrates the effectiveness of career incentives linked to publication.     

新制度经济学的新发展与政治学新制度主义:比较与启示

新制度经济学和政治学新制度主义在发展中都因为缺乏现实性、历史性和社会性而受到批评.面对相似的问题,经济学领域兴起了以青木和格雷夫为代表的比较制度分析,政治学领域兴起了历史制度主义和社会学制度主义.本文从制度观、制度对行为的影响、制度的变迁、过去的制度对现在制度的影响、文化观念和意识形态在制度形成和发展中的作用等方面,对比较制度分析和历史制度主义、社会学制度主义进行了比较,就未来制度研究的发展趋势提出了看法.     

从经济学再到政治经济学:理解包容性增长

胡锦涛主席在亚太经合组织的两次会议上倡导包容性增长,其理论与现实意义深远。经济增长自经济学诞生以来就一直是经济研究的核心问题,经济学史上从政治经济学到经济学,再到最近新政治经济学的兴起实际上反映了人们对经济发展中的繁荣与公正、市场与政府的认知的深入过程。强调机会平等的包容性增长正是当下中国的政治经济学。从经济学发展过程审视政治与经济离合的演变有助于我们深入理解和研究包容性增长。     

The economics of research,consulting, and teaching quality: theory and evidence from a technical university

We investigate the effect of both research and consulting on teaching quality in higher education, at the individual level. We propose a theoretical model in which academics allocate effort between the three activities, over a two period time horizon, under the assumption of positive spillovers from research to both consulting opportunities and teaching, and of life-cycle effects on incentives. Propositions from the model are tested against data from a mid-sized Italian engineering faculty. We find that teaching quality is negatively related to consulting and positively related to research experience. However, both relationships are not linear, due to the importance of several mediating factors, such as seniority and the role of scientific publications as a signal for attracting consulting opportunities.     

Holding back from theory: limits and methodological alternatives of randomized field experiments in development economics

ABSTRACT

In this paper, we critically and constructively examine the methodology of evidence-based development economics, which deploys randomized field experiments (RFEs) as its main tool. We describe the context in which this movement started, and illustrate in detail how RFEs are designed and implemented in practice, drawing on a series of experiments by Pascaline Dupas and her colleagues on the use of bednets, saving and governance in Kenya. We show that this line of experiments have evolved to address the limitation of obtaining policy-relevant insights from RFEs alone, characterized as their lack of external validity in the literature. After examining the two prominent responses by leading figures of evidence-based development economics, namely machine learning and structured speculation, we propose an alternative methodological strategy that incorporates two sub-fields, namely experimental economics and behavioral economics, to complement RFEs in investigating the data-generating process underlying the treatment effects of RFEs. This strategy highlights promising methodological developments in RFEs neither captured by the two proposals nor recognized by methodologists, and also guides how to combine different sub-fields of economics.     

Beyond Homo economicus: evidence from experimental economics

Environmental policies are generally based on a model of the human actor taken from neoclassical economic theory. This paper reports on laboratory experiments suggesting weaknesses in this model and describes alternative models correcting these weaknesses. One finding is that economic actors tend to be hyperbolic as opposed to exponential discounters who discount the immediate future at a higher rate than the more distant future. Another finding is that economic actors are not self-regarding, but rather in many circumstances are strong reciprocators who come to strategic interactions with a propensity to cooperate, respond to cooperative behavior by maintaining or increasing cooperation, and respond to free-riders by retaliating against the ‘offenders’, even at a personal cost, and even when there is no reasonable expectation that future personal gains will flow from such retaliation. We discuss some implications for policy analysis.     

Citations,journal ranking and multiple authorships: evidence based on the top 300 papers in economics

Two propositions are examined with reference to the top 300 papers in economics journals in terms of citations as reported by RePec. The results show that while there is significant correlation between the quality of a journal and the number of top papers published in that journal, the correlation is far away from being perfect. Furthermore, citations are not related to the number of authors, which provides evidence against the proposition that multi-authored papers are typically of higher quality than single-authored papers. The results also cast a shadow of doubt on the soundness of the bucket classification of journals.     

Darwinism in economics: from analogy to ontology

Several social scientists, including ‘evolutionary economists’, have expressed scepticism of ‘biological analogies’ and rejected the application of ‘Darwinism’ to socio-economic evolution. Among this group, some have argued that self-organisation is an alternative to biological analogies or Darwinism. Others have seen ‘artificial selection’ as an alternative to natural selection in the socio-economic sphere. Another objection is that Darwinism excludes human intentionality. It is shown that all these objections to ‘biological analogies’ and ‘Darwinism’ are ungrounded. Furthermore, Darwinism includes a broad theoretical framework for the analysis of the evolution of all open, complex systems, including socio-economic systems. Finally and crucially, Darwinism also involves a basic philosophical commitment to detailed, cumulative, causal explanations. For these reasons, Darwinism is fully relevant for economics and an adequate evolutionary economics must be Darwinian, at least in these fundamental senses. However, this does not undermine the need for auxiliary theories and explanations in the economic domain.     

The arrow of time in economics: from Robinson's critique to the new historical economics

Abstract

How time is comprehended in economics is central to the type of discipline to which economics is analogized. Rejecting the symmetrical notion of time in classical physics, Joan Robinson emphasized the importance of ‘historical time’, and hence history. A new generation of economists – including Paul Krugman, Paul David, and Brian Arthur – took up Robinson's challenge, seeking to create a new historical economics by relating random or ‘accidental’ historical events in different ways to the necessity of economic rules, and finding that, as Robinson saw, scale effects were crucial. Their efforts, however, fell short of integrating history into economics.     

Simon's and Siegel's responses to the 'mixed strategy anomaly': a missed case in the sensitivity of economics to empirical evidence

In some of their papers published in the 1950s, Herbert Simonand Sidney Siegel responded to the so-called mixed strategyanomaly in ways which deserve more attention. They producednot only (i) immediate defences of the economic theory of theirown time, but also (ii) ideas and solutions that have laterturned out to be significant contributions to the developmentof the economic theory of choice and decision-making and theseparation of experimental economics from experimental psychology.These observations suggest that economics can be more responsiveto empirical anomalies than has been assumed. Furthermore, knowledgeof the desirable responsiveness to anomalies can provide meansof avoiding the non-desirable immunity to anomalies.     

The nature of heterodox economics

Heterodoxy serves as an umbrella term to cover the coming togetherof separate projects or traditions. In answering the question,‘what distinguishes heterodoxy from the orthodoxy?’,the author argues that matters of ontology are central. In answeringthe question, ‘how are the various traditions that makeup the modern heterodoxy to be distinguished from each other?’,the author defends criteria other than varying commitments tospecific substantive theories, policy measures or techniques(or basic units) of analysis.