On the general birth-and-death-with-immigration stochastic process

Abstract

In a series of previous papers I have dealt with the theory of stochastic processes [1–5] and their applications for the analysis of the interaction between radiation and matter, especially in cosmic radiation [6] and in carcinogenesis [7–10]. In these and other applications of stochastic processes for the analysis of problems in natural science [10–13] the so-called birth-and-death-with-immigration process plays an important role.     

Plant variety protection in developing countries. A report from the field

The establishment of intellectual property rights (IPRs) for plant varieties has caused considerable controversy, but there is relatively little empirical evidence on performance and options in developing countries. This paper summarizes the results of a recent five-country study, concentrating on the conduct of plant variety protection (PVP) regimes. It examines PVP in the context of other mechanisms that provide incentives for plant breeding. It discusses the principal options available to developing countries and examines the ability of PVP to offer protection from competing firms and from on-farm seed saving. It also looks at the administrative and management requirements of PVP regimes. Although the paper does not discuss patent protection for biotechnology it examines the IPR requirements for the introduction of transgenic varieties. Developing countries need to establish an appropriate PVP system, but PVP should be seen as part of a broader strategy for seed system development.     

The Post‐Privatization Role of Out‐growers' Associations in Rural Capital Accumulation: Contract Farming of Sugar Cane in Kilombero,Tanzania

Contract farming is widely promoted by multilateral agencies as an engine of economic growth in developing countries. The agencies often stress the need for governments to create strong farmers' organizations that can shoulder the risks associated with contractual relationships with large corporations. However, empirical studies of farmers' organizations in contractual schemes are few and tend to dismiss the performances of these organizations for not measuring up to donor expectations. This paper seeks to offer a more unbiased examination of what farmer's organizations actually do by recounting the development of out‐growers' associations in a contract farming scheme in central Tanzania. The paper explores the new space for social organization and business operations which emerged after privatization in 1998. It is argued that under certain conditions, out‐grower associations occupy a crucial position with regard to classic agrarian questions of land, labour and capital accumulation.     

Two Lighthouses to Navigate: Effects of Ideal and Counter-Ideal Values on Follower Identification and Satisfaction with Their Leaders

Ideals (or ideal values) help people to navigate in social life. They indicate at a very fundamental level what people are concerned about, what they strive for, and what they want to be affiliated with. Transferring this to a leader–follower analysis, our first study (n = 306) confirms that followers’ identification and satisfaction with their leaders are stronger, the more leaders match followers’ ideal leader values. Study 2 (n = 244) extends the perspective by introducing the novel concept of counter-ideals (i.e., how an ideal leader should not be) as a second, non-redundant point of reference. Results confirm that a leader’s match on ideal and on counter-ideal values have independent effects in that both explain unique variance in followers’ identification and satisfaction with their leader. Study 3 (n = 136) replicates the previous results in an experimental scenario study and provides evidence for the proposed causal direction of the underlying process. We conclude that counter-ideal values might be an additional point of reference that people use to triangulate targets above and beyond ideal values and discuss the implications of our findings for value research and management.     

Twenty-five years of Living Under Contract: Contract farming and agrarian change in the developing world

The expansion of contract farming schemes through regions of the developing world in the era of the globalization of agriculture raises questions that are central to the study of agrarian political economy. Contract farming has extended the footprint of commodity production and integrated land and labour not otherwise captured in forms of direct production and marketing. 25 years after the publication of Living Under Contract: Contract Farming and Agrarian Transformation in Sub-Saharan Africa, a foundational collection edited by Peter Little and Michael Watts, it is necessary to take stock of the most prominent developments in the practice of contract farming and in the political economy literature studying it. The ultimate contribution of Living Under Contract was framing contract farming as expressing the unevenness of power relations in agriculture and grounding it in specific political, historical and social contexts that were not examined in the mainstream accounts. This introduction to the special issue revisits the questions that have remained relevant or re-emerged in the political economy literature on contract farming; it raises new questions that reflect contemporary developments and it explains how the papers in this collection contribute to the expansion of the theoretical and empirical horizons of the research on contemporary contract farming in low and middle-income countries.