The Economics of Farm Fragmentation: Evidence from Ghana and Rwanda

Farm fragmentation, in which a household operates more thanone separate parcel of land, is a common phenomenon in Sub-SaharanAfrica. Concerned by the perceived costs of fragmented as opposedto consolidated holdings, several countries have implementedland consolidation programs. But these interventions overlookthe benefits that land fragmentation can offer farmers in managingrisk, in overcoming seasonal labor bottlenecks, and in bettermatching soil types with necessary food crops. This articleuses household data from Ghana and Rwanda to discuss the incidenceand causes of fragmentation. It then formally tests the relationbetween fragmentation and land productivity and risk reduction.The conclusion is that consolidation programs are unlikely tolead to significant increases in land productivity and may actuallymake farmers worse off. Policymakers should focus instead onreducing the root causes of fragmentation: inefficiencies inland, labor, credit, and food markets.     

Consistency of elementwise-weighted total least squares estimator in a multivariate errors-in-variables model <Emphasis Type="Bold">AX=B</Emphasis>

A multivariate measurement error model AXB is considered. The errors in [A,B] are rowwise independent, but within each row the errors may be correlated. Some of the columns are observed without errors, and in addition the error covariance matrices may differ from row to row. The total covariance structure of the errors is supposed to be known up to a scalar factor. The fully weighted total least squares estimator of X is studied, which in the case of normal errors coincides with the maximum likelihood estimator. We give mild conditions for weak and strong consistency of the estimator, when the number of rows in A increases. The results generalize the conditions of Gallo given for a univariate homoscedastic model (where B is a vector), and extend the conditions of Gleser given for the multivariate homoscedastic model. We derive the objective function for the estimator and propose an iteratively reweighted numerical procedure.Acknowledgements.A. Kukush is supported by a postdoctoral research fellowship of the Belgian office for Scientific, Technical and Cultural Affairs, promoting Scientific and Technical Collaboration with Central and Eastern Europe. S. Van Huffel is a full professor with the Katholieke Universiteit Leuven. This paper presents research results of the Belgian Programme on Interuniversity Poles of Attraction (IUAP Phase V-22), initiated by the Belgian State, Prime Ministers Office-Federal Office for Scientific, Technical and Cultural Affairs, of the Concerted Research Action (GOA) projects of the Flemish Government MEFISTO-666 (Mathematical Engineering for Information and Communication Systems Technology), of the IDO/99/03 project (K.U. Leuven) Predictive computer models for medical classification problems using patient data and expert knowledge, of the FWO projects G.0200.00, G.0078.01 and G.0270.02. The scientific responsibility is assumed by its authors. The authors would like to thank Maria Luisa Rastello and Amedeo Premoli for bringing the EW-TLS problem to their attention. The authors are grateful to two anonymous referees for the valuable comments.     

Wunden erfolgreich behandeln

Wound Care Management (MSc.) – Eine erfolgreiche Wundbehandlung setzt umfangreiches Wissen und Erfahrung voraus. Im Pflegealltag allgegenw?rtig und komplex, ist das Thema jedoch nicht immer optimal gel?st. Ein neuer Studiengang verbindet Praxis und Wissenschaft zu einer besonderen Qualifizierung, die der Bedeutung des T?tigkeitsfelds gerecht wird.     

TAX EVASION AND STATE PRODUCTIVITY—AN EXPERIMENTAL STUDY

In an overlapping generations experiment with multiple families participants can support their parents directly and thereby reduce their tax burden or rely on tax‐financed old‐age support. State productivity is captured by the factor with which total tax revenues are multiplied to determine old‐age support. This factor is systematically varied from 0.75 to 1.25. Tax payments depend on declared endowment. Tax evasion is possible, but monitored. Our results suggest that state productivity influences neither direct support of own parents nor tax evasion. The main effect is that rich endowment triggers relatively low support of own parents and high (and more frequent) tax evasion.     

Stürzen vorbeugen

Zusammenfassung  Prophylaxen in der Pflege — Je ?lter Menschen sind, desto h?ufiger passieren Stürze. In der Gruppe der über 70-J?hrigen stürzt mehr als ein Drittel mindestens einmal. Eine der gravierensten Folgen dabei der Oberschenkelhalsbruch: In Deutschland sind es bis zu 100.000 Frakturen pro Jahr. Sturz ist damit ein relevanter Kostenfaktor für das Gesundheitswesen.     

Kontrakturen

Zusammenfassung  Prophylaxen in der Pflege — Im Vergleich zu T?nzern haben die meisten Menschen „Kontrakturen“, denn Muskeln und B?nder bleiben nur so lange dehnungsf?hig, wie es für den t?glichen Gebrauch erforderlich ist. Zudem versch?rfen Erkrankungen der Gelenke, Muskeln, Sehnen, B?nder und Narbenzüge das Problem. Kontrakturen sind also ein Ph?nomen, gegen das angegangen werden muss, damit keine Bewegungseinschr?nkungen entstehen.     

The Impact of Entrepreneurship Education on Entrepreneurial Attitudes and Intention: Hysteresis and Persistence

Do entrepreneurship education programs (EEPs) really influence participants’ attitudes and intention toward entrepreneurship? How is this influence related to past experience and how does it persist? Researchers and entrepreneurship education stakeholders alike have been looking into this question for quite a while, with a view to validating the efficacy of such programs. The authors of this paper propose to operationalize the concept of entrepreneurial intention and its antecedents in an attempt to address those issues. In particular, we propose an original research design where (1) we measure the initial state and persistence of the impact and not only short‐term effects; (2) we deal with a compulsory program, allowing to avoid self‐selection biases; and (3) we deal with an homogeneous “compact” program rather than programs combining multiple teaching components whose effects cannot be disentangled. Our main research results show that the positive effects of an EEP are all the more marked when previous entrepreneurial exposure has been weak or inexistent. Conversely, for those students who had previously significantly been exposed to entrepreneurship, the results highlight significant countereffects of the EEP on those participants.     

Social Embeddedness in Electronic Negotiations

This study contributes to electronic negotiation research by analyzing the role of social embeddedness of actors in a controlled laboratory experiment. In particular, we analyze the effect of prior negotiator relationship in different conflict levels in web-based negotiations. We hypothesize that with increasing intensity of conflicts, negotiators who have a personal relationship use more value creating strategies compared to anonymous negotiators. As a consequence, we also hypothesize to find fewer impasses in electronic negotiations involving subjects who are socially embedded. Our results confirm that, in fact, in severe conflicts socially embedded actors reach significantly more agreements than subjects of the control group while such an effect is not found in weak conflict situations. These findings are related to more yielding between embedded actors but not to more value creating behavior. From these results, we can conclude that socially embedded negotiators better manage to reach agreements in difficult situations. Furthermore, an institutionalized pre-negotiation phase which allows negotiators to establish a personal relationship can counteract the threat of impasses.