Thesis (Ph. D.)--University of Hawaii at Manoa, 2005. / Includes bibliographical references (leaves 121-124). / Also available by subscription via World Wide Web / xi, 124 leaves, bound ill. 29 cm

Typescript. / Thesis (Ph. D.)--University of Hawaii at Manoa, 1976. / Bibliography: leaves [178]-188. / Microfiche. / ix, 188 leaves

<p>Oilseed is the third most important export item in Ethiopian foreign trade. It has registered a high export growth rate over recent years both in terms of volume and value. Besides its growing share in export, it is widely used for the extraction of edible oil and oilcake that is supplied to the domestic market. Although farmers are the primary producers of oilseeds, they are not able to benefit from the growing market share of the product due to the fact that they find themselves at the end of an extended market chain. As a result they only receive a very small proportion of what the final buyers are paying for the oilseed products. In addition, there is not much experience on the part of the farmers to process oilseeds, change it to edible oil and oilcake and retain the value addition in the local economy. This thesis used the value chain approach to investigate the possibilities for the primary producers to increase their income share from the selling of their products either by directly selling to exporters or by processing oilseeds, producing edible oil and oilcake, and retaining the value addition in the local economy.</p>

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Thesis (MScAgric (Horticulture))--University of Stellenbosch, 2007. / Most nectarine orchards in South Africa are currently planted at a distance of 4 x 1.5 m (2 500 trees/ha). These trees are mainly sylleptically trained to a central leader, although many producers also use the proleptic route. The former produces relatively high yields early in the lifetime of the orchard. A problem with nectarine production in South Africa is the lack of efficient rootstocks in terms of aspects such as size-control and the use of nematode-resistant rootstocks. The aim of this study is to evaluate different training systems for nectarine production and to investigate the role of three rootstocks that play a dominant role in the peach industry in South Africa. ‘Alpine’ nectarines were planted in the winter of 2002 at Lushof near Ceres, Western Cape, South Africa (33º18’S, 19º20’E). The trees were trained according to four different training systems: a four-leader system (5 x 3 m; 667 trees/ha), a two-leader system (5 x 1.5 m; 1 333 trees/ha), a proleptically trained central leader (5 x 1 m; 2 000 trees/ha), and a sylleptically trained central leader (5 x 1 m; 2 000 trees/ha). The trees were planted on three different rootstocks: GF 667; SAPO 778; Kakamas seedling. The time spent per tree on pruning, thinning and picking was recorded. During harvest, the number of fruit and fruit mass per tree were recorded. Light measurements were recorded annually after summer pruning. The measurements were taken at different heights and at different depths in the canopy. To compare the training systems on an economic basis, the data from the trial together with projected data gathered from farmers and advisors were used to calculate the net present value (NPV) and internal rate of return (IRR) for each training system. The results showed that rootstock only played a significant role when it came to fruit mass (fruit size). Fruit from trees on SAPO 778 were heavier, indicating bigger fruit, than fruit from trees on Kakamas seedling rootstocks and this can play a role in packout percentage and income. In terms of the training system, the four-leader system took the most time to manage per tree. However, this system took the least time to manage per hectare during the initial years. No differences were found between the two central leaders. They both took the longest time to manage per hectare. The four-leader system produced significantly less fruit than any of the other systems during the first two years of production. In the third year of production, there was no significant difference found between the systems. Light penetration seemed to be the poorest at the middle and bottom of the canopy for trees trained to a central leader. Because of the open centre of the four-leader system, light penetration into the middle of these trees was good, but poor light penetration occurred in the upper and outer parts of the canopy underneath the scaffold branches. Poor light penetration occurred in the parts lower than 1.5 m from the ground for all the systems. This was the area that was measured in this study. The result of an economic comparison showed that according to the IRR rating, the fourleader system should be preferred. The final decision should however be made according to the NPV rating. Results obtained from NPV calculations did not lead to the same conclusions as could be made from the IRR calculations. According to the rating of the NPV at five percent discounting rate, the two-leader should be the preferred system, while the proleptically trained central leader system should be preferred at a ten percent discounting rate. This implies that when the opportunity cost is low, the two-leader system should be preferred, and when the opportunity cost is high, the proleptically trained central leader system should be preferred.

Thesis (MPhil)--University of Stellenbosch, 2006. / ENGLISH ABSTRACT: The role of the media as a watchdog for the social institution of science is viewed as part of the media’s role to protect society. In this regard, the role of media was studied in reporting the phenomenon of the commercialisation of academic research at universities. The current study was conducted by analysing articles in 2 scientific journals (Science and Nature) and 4 printed newspapers (The New York Times, London Times, Mail & Gaurdian, Business Day) for the year 2003. The methods of investigation for each publication included the number of articles covering the topic, the percentage coverage, headline analysis, summary of contents and analysis of the themes. The New York Times had more articles on the topic of the “commercialisation of science at universities” than the other publications. However, based on the number of issues per year, Science and Nature had a greater coverage of the topic than The New York Times. Based on the analyses of the articles, it is concluded that The New York Times had the most balanced and informed coverage of all the issues and stakeholders involved in the commercialisation of science at universities. This is attributed to the The New York Times’s position of standing outside the realm of science and its experience in covering broad issues. / AFRIKAANSE OPSOMMING: Die rol van die media as ‘n waghond vir die sosiale instelling van die wetenskap, word gesien as deel van die media se rol as die beskermer van die samelewing. In hierdie opsig is die media se rol in die verslaglewering van die kommersialisering van die wetenskap by universiteite ondersoek. Hierdie studie is uitgevoer deur artikels in 2 wetenskaplike vaktydskrifte (Science en Nature) en 4 koerante (The New York Times, London Times, Mail & Guardian, Business Day) vir die jaar 2003, te analiseer. Die metodes wat gebruik is om elke artikel te ontleed, het die aantal artikels, die persentasie van artikels in elke publikasie, hoofopskrif analise, opsomming van inhoud en ‘n analise van die artikel se tema, ingesluit. The New York Times het meer artikels omtrent die onderwerp, die “kommersialisering van die wetenskap by universiteite”, as die ander publikasies gehad. Gebaseer op die aantal uitgawes per jaar, het Science en Nature meer aandag geskenk aan die onderwerp as The New York Times. Volgens die analises van die artikels, word afgeleui dat The New York Times die mees gebalanseerde en ingeligte dekking gehad het oor die betrokke sake en partye in die “kommersialisering van die wetenskap by universiteite”. Dit word toegeskryf aan die The New York Times se posisie as buitestaander in die wetenskap en die koerant se ondervinding om ‘n wye veld te dek.

This dissertation disputes conventional interpretations of the comparative political economy literature on higher education. In particular, I challenge the common assumption that access to higher education is structured by income. Instead, based on insights from the relevant psychology, sociology and economics literature, I argue that a child's probability of entering higher education is predominantly a function of her abilities, and that her abilities are strongly related to her parents' level of education. I develop a theory of the distributive politics of higher education solidly grounded in this relationship. The result of this model is the counter intuitive hypothesis that the initial expansions of higher education benefit the children of more highly educated parents. Moreover, more highly educated families are the net beneficiaries of free higher education and generous subsidies. Extensive survey evidence from Britain, Australia, Canada and Sweden of higher education policy preferences confirms this picture of the politics of higher education as a zero-sum distributive game between highly and lesser educated families. In order to analyse the consequences of these preference patterns for higher education policy, I develop a theoretical and empirical measure of voting power for multi-party systems. Voting power measures how many votes a party stands to gain from converting and mobilising voters by distributing resources from one group to another. Using data from 15 EU countries, I show that parliaments and cabinets, on average, stand to win more votes from pleasing highly educated voters than from targeting less educated voters. Furthermore, the conversion imperative is much stronger than the mobilisation imperative. Statistical analyses show that variations in the voting power of highly educated individuals over the government help to explain variations in higher education policy across countries and within countries over time. All in all, the theoretical and empirical analyses presented in this dissertation represent a significant contribution towards understanding the specific distributive politics of higher education, and the political economy of redistribution more generally.

This thesis concerns three important issues related to the problem of time-inconsistency in decision-making and revealed preference analysis. The first chapter focuses on the welfare properties of equilibria in exchange economies with time-dependent preferences. We reintroduce the notion of time-consistent overall Pareto efficiency proposed by Herings and Rohde (2006) and show that, whenever the agents are sophisticated, any equilibrium allocation is efficient in this sense. Thereby, we present a version of the First Fundamental Welfare Theorem for this class of economies. Moreover, we present a social welfare function with maximisers that coincide with the efficient allocations and prove that every equilibrium can be represented by a solution to the social welfare optimisation problem. In the second chapter we concentrate on the observable implications of various models of time-preference. We consider a framework in which subjects are asked to choose between pairs consisting of a monetary payment and a time-delay at which the payment is delivered. Given a finite set of observations, we are interested under what conditions the choices of an individual agent can be rationalised by a discounted utility function. We develop an axiomatic characterisation of time-preference with various forms of discounting, including weakly present-biased, quasi-hyperbolic, and exponential, and determine the testable restrictions for each specification. Moreover, we discuss possible identification issues that may arise in this class of tests. Finally, in the third chapter, we discuss the testable restrictions for production technologies that exhibit complementarities. Suppose that we observe a finite number of choices of input factors made by a single firm, as well as the prices at which they were acquired. Under what conditions imposed on the set of observations is it possible to justify the decisions of the firm by profit-maximisation with production complementarities? In this chapter, we develop an axiomatic characterisation of such behaviour and provide an easy-to-apply test for the hypothesis which can be employed in an empirical analysis.

This DPhil thesis consists of three related but independent chapters discussing the question of admission and access to higher education. Chapter 1 explores the extent to which the underrepresentation of students from certain population groups at highly selective universities, can be explained by poor information and high non-monetary application costs, and how the universities' admission policies may affect outcomes. This chapter takes a positive approach and proposes a theoretical model to explore the implications of implementing alternative admission policies. Motivated by the results that arise from this exploration, Chapter 2 proceeds with a normative approach, proposing a general framework to study the optimal selection policy from a pool of applicants, taking into account that the pool of applicants is endogenous. This, it is argued, allows a characterisation of the optimal form of discrimination in university admissions. Chapter 3 studies the relationship between tuition fees and academic selectivity, by developing a different, although somewhat related model of monopolistic competition, where universities compete for students by simultaneously selecting prices and admission standards.