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Selected Abstracts

A decision support tool for irrigation infrastructure investments,

IRRIGATION AND DRAINAGE, Issue 4 2010
Shahbaz Khan
outil d'aide à la décision; gestion de l'eau; investissements saisonniers et à long terme; optimisation; simulation; analyse coûts-avantages; ensemble de l'exploitation; négociation de l'eau; économie d'eau Abstract Increasing water scarcity, climate change and pressure to provide water for environmental flows urge irrigators to be more efficient. In Australia, ongoing water reforms and most recently the National Water Security Plan offer incentives to irrigators to adjust their farming practices by adopting water-saving irrigation infrastructures to match soil, crop and climatic conditions. WaterWorks is a decision support tool to facilitate irrigators to make long- and short-term irrigation infrastructure investment decisions at the farm level. It helps irrigators to improve the economic efficiency, water use efficiency and environmental performance of their farm businesses. WaterWorks has been tested, validated and accepted by the irrigation community and researchers in NSW, Australia. The interface of WaterWorks is user-friendly and flexible. The simulation and optimisation module in WaterWorks provides an opportunity to evaluate infrastructure investment decisions to suit their seasonal or long-term water availability. The sensitivity analysis allows substantiation of the impact of major variables. Net present value, internal rate of return, benefit,cost ratio and payback period are used to analyse the costs and benefits of modern irrigation technology. Application of WaterWorks using a whole farm-level case study indicates its effectiveness in making long- and short-term investment decisions. WaterWorks can be easily integrated into commercial software such as spreadsheets, GIS, real-time data acquisition and control systems to further enhance its usability. WaterWorks can also be used in regional development planning. Copyright © 2009 John Wiley & Sons, Ltd. L'augmentation de la rareté de l'eau, le changement climatique et la pression pour fournir de l'eau pour l'environnement incitent les irrigants à être plus efficaces. En Australie les réformes en cours sur l'eau, et plus récemment le Plan National de Sécurité de l'Eau, incitent les irrigants à ajuster leurs pratiques agricoles par l'adoption d'infrastructures d'irrigation économisant l'eau pour s'adapter aux conditions de sols, de cultures et de climat. WaterWorks est un outil d'aide à la décision pour faciliter les décisions d'investissement à long terme et court terme au niveau de l'exploitation. Il aide les irrigants à améliorer l'efficacité économique, l'efficacité de l'utilisation de l'eau et la performance environnementale de leurs exploitations agricoles. Le WaterWorks a été testé, validé et accepté par la communauté de l'irrigation dans le New South Wales, Australie. L'interface de WaterWorks est convivial et flexible. Le module de simulation et d'optimisation dans WaterWorks permet d'évaluer les décisions d'investissement en fonction de la disponibilité en eau saisonnière ou à long terme. L'analyse de sensibilité permet d'étayer l'impact des principales variables. La valeur actuelle nette, le taux de rendement interne, le ratio coûts-avantages et la période de récupération sont utilisés pour analyser les coûts et les avantages des technologies modernes d'irrigation. L'application de WaterWorks à une étude de cas complète au niveau de l'exploitation montre son efficacité pour les décisions d'investissement à long terme et court terme. Le WaterWorks peut être facilement intégré dans des logiciels commerciaux tels que les tableurs, les SIG, des systèmes d'acquisition de données en temps réel et de contrôle afin d'améliorer sa convivialité. Le WaterWorks peut également être utilisé pour la planification du développement régional. Copyright © 2009 John Wiley & Sons, Ltd. [source]

An ex ante economic and policy analysis of research on genetic resistance to livestock disease: trypanosomosis in Africa

AGRICULTURAL ECONOMICS, Issue 2-3 2001
Cesar A. Falconi
Abstract This paper undertakes an ex ante economic analysis of research on how resistance to trypanosomosis-a dominant livestock disease in Africa-can be maintained and enhanced while retaining and reinforcing characteristics of economic importance to farmers, and on how,trypanotolerance' can be imparted to susceptible animals while retaining their other important traits. The results indicate that potential benefits to research-historically field-based but increasingly biotechnology-driven-range from two to nine times potential costs and that the internal rate of return on investments can be six times the real interest rate. Field-based research, while exhibiting lower potential benefits on aggregate than does biotechnology research, is also less costly and, because of its more immediate payback, has higher internal rates of return. Returns to biotechnology research hinge on close links with field-based research and on strategic but relatively small incremental human and capital investments. The results also suggest that further research is needed to consistently identify and track the impacts of alternative intellectual property rights (IPRs) options on the levels and distributions of biotechnology research benefits. [source]

Children's Economic Roles in the Maya Family Life Cycle: Cain, Caldwell, and Chayanov Revisited

POPULATION AND DEVELOPMENT REVIEW, Issue 3 2002
Ronald D. Lee
This article examines the relationship between household demographic pressure and interage transfers for a group of Maya subsistence agriculturists in Yucatán, Mexico. The authors use data from a field study conducted in 1992,93 on individual time allocation, relative productivity by age and sex, and caloric costs of activities to estimate age schedules of average consumption and production. Using these, they investigate the net costs of children to their parents and find that children have a negative net asset value up to the time they leave home. The direction of net wealth flows in this group is downward, from older to younger, and in economic terms the internal rate of return to children is highly negative up to the time they leave home. Nonetheless, children play a critically important role in the family's economic life cycle. On average, girls offset 76 percent of their consumption costs before leaving home at age 19, and boys offset 82 percent before leaving home at 22. Without the contributions from children as a group, parents would have to double or triple their work effort during part of the family life cycle if they were to raise the same number of children. By the thirteenth year of the family life cycle, children as a group produce more than half of what they consume in every year, and after the twentieth year children produce more than 80 percent of what they as a group consume. The authors also find that the elderly in the sample, ages 50 to 65, produce more than they consume. Thus while children have a negative net asset value to parents, the timing of their children's economic contribution across the family life cycle plays a key role in underwriting the cost of large families. [source]

Modelling selective breeding in protandrous, batch-reared Asian sea bass (Lates calcarifer, Bloch) using walkback selection

AQUACULTURE RESEARCH, Issue 10 2010
Nicholas Andrew Robinson
Abstract A bioeconomic simulation model for Lates calcarifer predicted that a strategy involving crossing current generation males with previous generation females would be a practical, effective and profitable way of dealing with protandry when batch rearing for selective breeding to improve the growth rate. The strategy allowed earlier initialization and more frequent ongoing rounds of selection, and resulted in a 16,19% higher overall response, than an alternative where each generation's males were crossed with the same generation's females. The strategy also yielded the highest short-term benefit,cost ratio (13:1 versus 7:1 after 8 years of selective breeding) and the highest short- and long-term value for participants in a breeding cooperative (a net present value of AU$28 million and an internal rate of return of 144% over 10 years), due to higher yields per fixed costs of production per unit area and due to savings in feed costs per kilogram of production. Breeding facilities of scale producing 50 full-sibling families per generation were found to be more profitable than those producing 100 families. [source]

Impact of research investment on Cassava production technologies in India,

AUSTRALIAN JOURNAL OF AGRICULTURAL & RESOURCE ECONOMICS, Issue 3 2009
Tavva Srinivas
The present study was an ex-post assessment done to validate past funding on cassava research, based on economic surplus approach. Though cassava was introduced as a food crop in Kerala, India from Brazil, it has changed its status to commercial crop at present in Tamil Nadu and Andhra Pradesh states. This was made possible due to intensive research and development efforts of different R&D organizations. Cassava technologies developed enabled in sustaining the crop in the country with the world's highest productivity. All the cassava production technologies considered in the study resulted in an economic surplus of Rs.3585.87 million in the target domain covering Kerala, Tamil Nadu and Andhra Pradesh. Consumers and producers benefited to the tune of Rs.2090.64 million and Rs.1495.23 million respectively. Net present value of economic gains was estimated to be Rs.3548.76 million. Present value of research investment on cassava production technologies was Rs.37.11 million resulting in benefit cost ratio of 96.63:1 with a high internal rate of return of 104 per cent. Thus the study indicated that the research investments incurred on cassava production technologies development was highly economical and provided evidence to the policy makers that supporting the research investment on underground, under exploited tropical root crops like cassava is an economically viable proposition. [source]

Comparative analysis of efficiency, environmental impact, and process economics for mature biomass refining scenarios

BIOFUELS, BIOPRODUCTS AND BIOREFINING, Issue 2 2009
Mark Laser
Abstract Fourteen mature technology biomass refining scenarios , involving both biological and thermochemical processing with production of fuels, power, and/or animal feed protein , are compared with respect to process efficiency, environmental impact , including petroleum use, greenhouse gas (GHG) emissions, and water use,and economic profitability. The emissions analysis does not account for carbon sinks (e.g., soil carbon sequestration) or sources (e.g., forest conversion) resulting from land-use considerations. Sensitivity of the scenarios to fuel and electricity price, feedstock cost, and capital structure is also evaluated. The thermochemical scenario producing only power achieves a process efficiency of 49% (energy out as power as a percentage of feedstock energy in), 1359 kg CO2 equivalent avoided GHG emissions per Mg feedstock (current power mix basis) and a cost of $0.0575/kWh ($16/GJ), at a scale of 4535 dry Mg feedstock/day, 12% internal rate of return, 35% debt fraction, and 7% loan rate. Thermochemical scenarios producing fuels and power realize efficiencies between 55 and 64%, avoided GHG emissions between 1000 and 1179 kg/dry Mg, and costs between $0.36 and $0.57 per liter gasoline equivalent ($1.37 , $2.16 per gallon) at the same scale and financial structure. Scenarios involving biological production of ethanol with thermochemical production of fuels and/or power result in efficiencies ranging from 61 to 80%, avoided GHG emissions from 965 to 1,258 kg/dry Mg, and costs from $0.25 to $0.33 per liter gasoline equivalent ($0.96 to $1.24/gallon). Most of the biofuel scenarios offer comparable, if not lower, costs and much reduced GHG emissions (>90%) compared to petroleum-derived fuels. Scenarios producing biofuels result in GHG displacements that are comparable to those dedicated to power production (e.g., >825 kg CO2 equivalent/dry Mg biomass), especially when a future power mix less dependent upon fossil fuel is assumed. Scenarios integrating biological and thermochemical processing enable waste heat from the thermochemical process to power the biological process, resulting in higher overall process efficiencies than would otherwise be realized , efficiencies on par with petroleum-based fuels in several cases. © 2009 Society of Chemical Industry and John Wiley & Sons, Ltd [source]

Economic Returns to Feed Barley Yield-increasing and Disease Resistance Research at the Alberta Field Crop Development Centre

CANADIAN JOURNAL OF AGRICULTURAL ECONOMICS, Issue 3 2003
Joseph G. Nagy
The Alberta Field Crop Development Centre (FCDC) at Lacombe has carried out an extensive research and development program on feed barley since 1973. Prior to 2002, FCDC released 11 hulled and six hull-less barley varieties that have been adopted by farmers. The primary objective of this study is to estimate an economic rate of return to the FCDC barley research and development program from 1973 to 2001. A secondary objective is to include benefits arising from research that improved feed barley disease resistance in new cultivars in addition to benefits from purely higher-yielding cultivar research. The analysis uses an ex post economic surplus methodology. Benefits are identified and empirically investigated for three separate FCDC feed barley research thrusts: , benefits arising from FCDC research that developed new, higher-yielding feed barley cultivars that give a yield advantage , benefits arising from FCDC research that improved feed barley disease resistance in new cultivars that result in yield loss avoidance from disease , benefits arising from FCDC research that developed new feed barley cultivars that yield higher silage production. Of the total benefits from research on feed grain varieties, 52% can be attributed to yield advantage research and 48% to yield loss avoidance research. The overall internal rate of return with base elasticity parameters is estimated at 27%, ranging between 23% and 31%, depending on the assumptions made about the yield advantage and base variety. The IRR was sensitive to changes in supply elasticities and ranges from 20% (,= 1.5) to 54% (,= 0.1). L'Alberta Field Crop Development Center (FCDC) de Lacombe poursuit un vaste programme de recherche et de dáveloppement sur l'orge fourragàre depuis 1973. Avant 2002, le FCDC a homologuá onze variátás d'orge ordinaire et six à grains nus que les agriculteurs ont par la suite adoptáes. La prásente átude devait estimer la rentabilitá du programme entre 1973 et 2001. Un objectif secondaire consistait à inclure les retombáes rásultant des cultivars plus rásistants à la maladie à celles dérivant uniquement de l'amélioration du rendement. L'analyse reposait sur la méthode ex-post des excédents économiques. L'auteur a identifié les retombées et les a examinées en fonction de trois courants distincts de la recherche entreprise au FCDC: (1) les retombées issues des cultivars d'orge fourragère à rendement plus élevé; (2) celles venant des travaux sur la résistance des variétés qui ont abouti à un meilleur rendement grâce à de moins grandes pertes attribuables à la maladie; (3) celles résultant de la création de cultivars d'orge fourragère produisant plus d'ensilage. Sur les retombées totales de la recherche, 52 % résultaient de l'amélioration du rendement et 48 % de la réduction des pertes associées à la maladie. On situe le taux de rentabilité interne global à 27 % avec les élasticités de base, soit entre 23 et 31 % selon les hypothèses sur l'amélioration du rendement et la variété de départ. Le taux de rentabilité interne est sensible à la variation des élasticités de l'offre et fluctue de 20 ,= 1, 5) à 54% (,= 0,1). [source]

An Economic Analysis of the Returns to Canadian Swine Research: 1974,97

CANADIAN JOURNAL OF AGRICULTURAL ECONOMICS, Issue 2 2001
Greg Thomas
This paper reports a new set of estimates of the returns to swine research in Canada. These estimates are obtained using Agriculture and Agri-Food Canada's Canadian Regional Agricultural Model (CRAM). Positive Mathematical Programming is incorporated into the model for use in this study. The CRAM allows the effects of supply shifts from technological change in the hog industry to interact with product and factor market conditions in the rest of Canadian agriculture. Extensive sensitivity analysis is conducted to examine the robustness of the return estimates under variations in some of the key assumptions employed in the analysis. The costs of public and private sector swine research are estimated. Public sector research costs are inclusive of the marginal excess burden of taxation. Overall, the estimated benefits from Canadian swine research are high relative to the estimated costs for the time period considered. Previous estimates of the returns to Canadian swine research were obtained by Huot et al. (1989) with a partial equilibrium model that did not allow for intra-sectoral resource use adjustments. The estimated returns obtained in the present study are generally higher than those obtained by Huot et al. For example, the estimates obtained from the direct application of the econometrically estimated supply function in this study gave an internal rate of return of about 124% and a benefit-cost ratio of 22.4 to 1. Huot et al reported comparable estimates of about 43% for the internal rate of return and 6,7 to 1 for the benefit-cost ratio. The differences in returns are not solely attributable to the use of a multi-market versus a single-market partial equilibrium approach. There are also differences in the estimates of the marginal excess burden of taxation between the two studies. L'analyse que void présente une nouvelle série d'estimations quant au rendement de la recherche porcine au Canada. Ces estimations dérivent du Modèle d'analyse régionale de l'agriculture du Canada (MARAC) du ministère canadien de l'Agriculture et de l'Agroalimentaire. Aux fins de la présente étude, on avait intégré au modèle une programmation mathématique positive. Le MARAC autorise l'interaction entre les retombées d'une modification de l'offre attribuable au virage technologique de l'industrie porcine et les conditions du marché des produits et des facteurs dans le reste de l'agriculture canadienne. Les auteurs ont effectué une analyse de sensibilité poussée en vue d'établir la robustesse de leurs estimations quand variaient quelques-unes des principales hypotheses de l'analyse. On a estimé le coût de la recherche sur les pores poursuivie par les secteurs public et privé. Dans le secteur public, le coût de la recherche incluait une charge fiscale légérement excessive. Dans l'ensemble, la recherche sur les porcs entreprise au Canada a rapporté beaucoup comparativement à ce qu'elle a coûté pendant la période à l'étude. Les estimations antérieures, établies par Huot et ses collaborateurs (1989), venaient d'un modèle àéquilibre partiel ne permettant aucun ajustement pour l'utilisation intra-sectorielle des ressources. Les revenus estimés ici sont généralement plus élevés que ceux de Huot et de ses collaborateurs. Ainsi, une application directe de l'offre estimée par des méthodes économétriques à l'analyse donne un taux de rendement interne d'environ 124 % et un indice de rentabilité de 22,4 pour 1. À titre de comparaison, Huot et ses collaborateurs rapportent des résultats d'environ 43 % pour le taux de rendement interne et de 6 à 7 pour 1 en ce qui concerne l'indice de rentabilité. Pareil écart ne résulte pas uniquement du choix d'un modèle àéquilibre partiel reposant sur plusieurs marchés au lieu d'un seul; on relève aussi des variations dans l'estimation du léger excès de la charge fiscale entre les deux études. [source]

Distributional Impacts of Pension Policy in Argentina: Winners and Losers within and Across Generations

INTERNATIONAL SOCIAL SECURITY REVIEW, Issue 3 2006
Camila Arza
The paper deals with the life-cycle intra- and intergenerational income transfers operated by the pension system in Argentina by estimating the internal rates of return obtained by different generations and types of workers from their participation in the system. The empirical analysis confirms that earlier generations of workers benefited from higher social security returns than later generations, which retired under a matured system with large deficits. The worst-affected cohorts were those born after 1920, particularly suffering from a social security crisis and falling real wages. For future generations retiring fully under the new mixed pension system, returns will more closely depend on financial market performance and the evolution of administration costs. Intragenerational transfers were also observed for all cohorts under study, as a result of the original system design as well as adjustments adopted during the implementation process. The real distributional impact of progressive benefit formulas could, however, be offset by state transfers to cover pension deficits and forward tax shifting in a context of unequal pension coverage. [source]

An ex ante economic and policy analysis of research on genetic resistance to livestock disease: trypanosomosis in Africa

Co-evolutionary Dynamics Within and Between Firms: From Evolution to Co-evolution

JOURNAL OF MANAGEMENT STUDIES, Issue 8 2003
Henk W. Volberda
abstract The extensive selection,adaptation literature spans diverse theoretical perspectives, but is inconclusive on the role of managerial intentionality in organizational adaptation. Indeed this voluminous literature has more to say about selection and sources and causes of structural inertia than about self-renewing organizations that might counteract such inertia. In this introductory essay, we identify four co-evolutionary generative mechanisms (engines) , naïve selection, managed selection, hierarchical renewal and holistic renewal , which illustrate the extensive range of evolutionary paths that can take place in a population of organizations. In particular, the managed selection engine provides the foundations of the underlying principles of co-evolving self-renewing organizations: managing internal rates of change, optimizing self-organization, and balancing concurrent exploration and exploitation. However, it is altogether clear that empirical co-evolution research represents the next frontier for empirically resolving the adaptation selection debate. The essay concludes with a discussion of requirements for co-evolutionary empirical research and introduces the empirical papers in this Special Research Symposium. [source]