Growing energy use and greenhouse gas emissions have implied an increased attention to the development of renewable energy sources. Bioenergy from forest biomass is expected to be one of the cornerstones in reaching renewable energy targets, especially in forest-rich countries such as Sweden. However, forest biomass is a limited resource, and an intensified use of bioenergy could affect roundwood and forest products’ markets in several ways. The overall purpose of this thesis is to analyze price formation and resource allocation of forest raw materials in the presence of increased bioenergy demand. The empirical focus is on the competition for wood fibres between bioenergy use and the traditional forest industries, as well as synergy effects between the various sectors using forest raw materials. The methodologic approach is partial equilibrium modeling (forest sector model), and the geographical focus is on Sweden. The thesis comprises three self-contained articles, which all address the above issues. The first paper presents an economic assessment of two different policies – both implying an increased demand for forest ecosystem services – and how these could affect the competition for forest raw materials. A forest sector trade model is updated to a new base year (2016), and used to analyze the consequences of increased bioenergy use in the heat and power (HP) sector as well as increased forest conservation in Sweden. These overall scenarios are assessed individually and in combination. The results show how various forest raw material-using sectors are affected in terms of price changes and responses in production. A particularly interesting market impact is that bioenergy promotion and forest conservation tend to have opposite effects on forest industry by-product prices. Moreover, combining the two policies mitigates the forest industry by-product price increase compared to the case where only the bioenergy-promoting policy is implemented. In other words, the HP sector is less negatively affected in terms of increased feedstock prices if bioenergy demand target are accompanied by increased forest conservation. This effect is due to increasing pulpwood prices, which reduces pulp, paper and board production, and in turn mitiges the competition for the associated by-products. Overall, the paper illustrates the great complexity of the forest raw material market, and the importance of considering demand and supply responses within and between sectors in energy and forest policy designs. The second article investigates the forest raw material market effects from introducing second-generation transport biofuel (exemplified by Bio-SNG) production in Sweden. Increases in Bio-SNG demand between 5 and 30 TWh are investigated. The simulation results illustrate increasing forest industry by-product (i.e., sawdust, wood chips and bark) prices, not least in the high-production scenarios (i.e. 20-30 TWh). This suggests that increases in second-generation biofuel productions lead to increased competition for the forest raw materials. The higher feedstock prices make the HP sector less profitable, but very meagre evidence of substitution of fossil fuels for by-products can be found. In this sector, there is instead an increased use of harvesting residues. Fiberboard and particleboard production ceases entirely due to increased input prices. There is also evidence of synergy (“by-product”) effects between the sawmill sector and the use of forest raw materials in the HP sector. Higher by-product prices spur sawmills to produce more sawnwood, something that in turn induces forest owners to increase harvest levels. Already in the 5 TWh Bio-SNG scenario, there is an increase in the harvest level, thus suggesting that the by-product effect kicks in from start. Biofuels and green chemicals are likely to play significant roles in achieving the transition towards a zero-carbon society. However, large-scale biorefineries are not yet cost-competitive with their fossil-fuel counterparts, and it is therefore important to identify biorefinery concepts with high economic performance in order to achieve widespread deployment in the future. For evaluations of early-stage biorefinery concepts, there is a need to consider not only the technical performance and the process costs, but also the performance of the full supply chain and the impact of its implementation in the feedstock and products markets. The third article presents – and argues for – a conceptual interdisciplinary framework that can form the basis for future evaluations of the full supply-chain performance of various novel biorefinery concepts. This framework considers the competition for biomass feedstocks across sectors, and assumes exogenous end-use product demand and various geographical and technical constraints. It can be used to evaluate the impacts of the introduction of various biorefinery concepts in the biomass markets in terms of feedstock allocations and prices. Policy evaluations, taking into account both engineering constraints and market mechanisms, should also be possible. Overall, the thesis illustrates the importance of considering the market effects when designing and evaluating forest policies and bioenergy policy targets. The forest industry sector and the bioenergy sector are closely interlinked and can both make or break one another depending on the policy design. The results indicate that for an increased demand of bioenergy, an industrial transformation is to be expected, as well as increased roundwood harvest.

Agricultural research and development (R&D) investment is becoming an increasingly important policy issue as food prices push upwards and food security problems emerge. An important source of agricultural R&D funding is from producer check-offs, which are increasingly being used to fund applied agricultural research such as disease management, genetic improvement, and weed control. Existing studies of producer-funded agricultural R&D indicate that there are high private and social rates of return to agricultural R&D investment by farmers, and thus that farmers are under investing in R&D. The focus of this thesis is at the producer level. This study examines one of the factors -- the horizon problem -- behind the apparent disincentive for farmers to invest in producer-funded R&D activities. It has been argued that given the long period of time over which the benefits of R&D investment occur, the increasing age of the farm population implies that the horizon problem could be indeed an important factor in producer underinvestment. Contrary to this widely acknowledged argument, this study shows the horizon problem is likely not a factor affecting farmers R&D investment decisions. Two models are developed to examine the horizon problem. The first model consists of a framework for determining the marginal internal rate of return of investing in R&D. Specifically, the model calculates the internal rate of return -- i.e., IRRh -- associated with the farmers' planning horizon and compares this to the internal rate of return -- i.e., IRR bar-- associated with the benefit horizon of the R&D. The impact of the horizon problem is determined by examining the difference between IRRh and IRR bar. The results of the horizon problem model show how that, contrary to what some authors have argued, the horizon problem is likely not a disincentive for R&D investment, unless the time horizon of farmers is very short. Given that the membership horizon for the average Canadian producer is 15 to 20 years, it is expected that the horizon problem is not an issue for Canadian producers. Furthermore, the analysis assumes farmers only are concerned with profit maximization. However, farmers may also consider other factors when making R&D investment decisions, such as future generations of agricultural producers and environment issues. The results of this study show that, even under the assumption of profit maximization, the horizon problem is not an issue for Canadian farmers, let alone in a more realistic model implemented by including factors other than profit. The results of the horizon problem model also show that the impact of the horizon problem is not affected by land tenure relationships. The second model consists of a multi-region, multi-product trade model that is used to examine the impact of Canadian pea R&D funding on consumers and producers in Canada and in various countries around the world that produce and consume pulses. To address the underinvestment issue, it is important to understand the question of who benefits from the research that is undertaken, and who bears the cost. Given that Canada is the largest pea exporter in the world an increase in R&D investment can be expected to have a significant impact on international trade and overseas producers and consumers. The simulation results from the second model illustrate that with increased pea R&D investment, Canadian producers, as well as consumers in all regions, are better off as a result of the R&D investment, while overseas producers are worse off. The results of the sensitivity analysis show that a pivotal supply shift associated with an increased levy, combined with a parallel supply curve shift due to increases in the knowledge stock, does affect the IRR in the large country versus the small country case. This result differs from the result that occurs when there is a parallel shift in supply at both the levy and R&D stages, indicating that it is important to understand the interaction between the manner in which R&D is funded, the way in which R&D affects supply and the trade status of a country. The results of the sensitivity analysis also indicate that the IRR to Canadian producers depends critically on how large an impact pea R&D has on the production of other crops (e.g., wheat and canola). The larger is this impact -- i.e., the more that wheat and canola production falls as a result of higher yields/lower costs of pea production -- the smaller is the IRR. The results also indicate that the elasticities of demand for peas and lentils in the importing countries do not have an impact on the IRR in the case where Canada is a large country exporter for peas only; however, they do have an impact on IRR in the case where Canada is a large exporter for both peas and lentils. In all cases, the more elastic is the demand, the higher is the IRR.

A União Européia e os Estados Unidos são os dois maiores importadores e exportadores mundiais de produtos agroindustriais. O Brasil é um dos mais dinâmicos fornecedores mundiais destes produtos. O país detém a terceira posição no ranking dos maiores exportadores mundiais e apresenta, desde 2002, o maior superávit comercial agroindustrial do mundo. A UE e os EUA poderiam importar ainda mais se não impusessem proteções de fronteira para seus produtos sensíveis. Picos tarifários, tarifas proibitivas, escaladas tarifárias, tarifas específicas, quotas tarifárias e salvaguardas especiais são os mecanismos de proteção analisados neste trabalho. Embora dirigidas para uma minoria de produtos, essas proteções são de grande relevância para o Brasil. As barreiras tarifárias foram analisadas sob três perspectivas: (i) das relações entre as barreiras e as políticas de apoio ao setor agrícola na UE e nos EUA; (ii) da inserção dos produtos brasileiros nesses mercados e (iii) da aplicação de um modelo de equilíbrio parcial para simulação dos efeitos sobre as importações diante de cenários de redução tarifária. O modelo de equilíbrio parcial baseia-se na elasticidade-preço cruzada da demanda por importação. Foram simuladas duas situações: reduções de 50% e de 100% nas tarifas. O modelo foi executado para uma seleção de produtos que fosse, ao mesmo tempo, sensíveis para UE e EUA, e de interesse do Brasil. Os seguintes setores foram analisados: açúcar e álcool, carne bovina, carne de frango, carne suína, suco de laranja, café torrado e solúvel, óleo de soja e fumo em folhas. Os resultados agregados mostram que as importações norte-americanas cresceriam 94% em valor (US$ 4,8 bilhões) e as européias 55% (€ 3,1 bilhões) para o cenário de 100% de redução tarifária. O modelo permite concluir que, caso as proteções de fronteira fossem efetivamente reduzidas, ambos os mercados demandariam volumes significativamente maiores de produtos que são exportados pelo Brasil. Conclui-se também que acordos de livre comércio como a Área de Livre Comércio das Américas (ALCA) e o Acordo UE-Mercosul, bem como as negociações multilaterais, se promoverem a liberalização dos mercados agrícolas, trarão ganhos inegáveis de comércio para o agronegócio brasileiro. / The European Union and the United States are the two largest world importers and exporters of agricultural products. Brazil is one of the most dynamic supplier of those commodities. Among the main agricultural exporters, Brazil is the third one and, since 2002, the country has had the largest agroindustrial trade balance surplus in the world. The EU and US would import even more if they were not allowed to impose border protection on their sensitive products. Tariff peaks, prohibitive tariffs, specific tariffs, tariff escalation, tariff quotas, and especial safeguards are the mechanisms analyzed by this work. Although these restrictions protect a small amount of products, their impact is huge on Brazil. The tariffs barriers were analyzed in three perspectives: (i) of the relations between the European and North-American policies to protect their agricultural sector and the barriers imposed; (ii) of the performance of the Brazilian agricultural exports in the previously mentioned foreign markets, and (iii) concerning different tariff reduction scenarios, of the utilization of a partial equilibrium model to quantify the effects on agricultural. The partial equilibrium model is based on price elasticities of import demand with respect to domestic prices. Two tariff reduction scenarios were simulated: 50% reduction and 100% reduction. The simulation model were run for a selection of products. Only products that could be considered not only sensitive for EU and US, but also relevant for Brazilian exports were selected. Sugar and ethanol, bovine meat, poultry meat, swine meat, orange juice, roasted coffee, instant coffee, soybean oil and unmanufactured tobacco were the sectors analyzed. The aggregated results show that the US imports would increase 94% (4,8 US billion) and EU imports 55% (3,1 € billion), in the case of 100% tariff reduction. The modeling results lead to the conclusion that, in the case of effective border protection reduction, both markets would demand higher quantity of products that are exported by Brazil. If agreements between the Free Trade Area of Americas and the EU-Mercosur, as well as the multilateral negotiations, end up promoting agricultural market liberalization, Brazilian agribusiness will profit enormously in terms of its trade.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / O Sistema Geral de Preferências (SGP), principal exemplo da concessão de preferências tarifárias unilaterais pelos países desenvolvidos, vem sendo usufruído pelos países em desenvolvimento há mais de 30 anos. O SGP dos EUA, um dos programas mais importantes para o país, vem recentemente sendo objeto de apreensão devido às ameaças que os EUA fez ao Brasil de retirá-lo do programa. Além disso, a possibilidade de uma reestruturação do programa no momento de sua renovação traz muita preocupação ao setor exportador que teme sofrer prejuízos. Este trabalho foi estruturado com o objetivo de estimar a perda das exportações brasileiras para os EUA se o Brasil for eliminado da lista dos países beneficiários do SGP. Usando uma metodologia de equilíbrio parcial, o efeito total sobre as exportações foi calculado através dos efeitos de criação e desvio de comércio. Os resultados indicam uma diminuição de aproximadamente US$ 393 milhões nas exportações destinadas aos EUA e essa perda estaria fortemente concentrada em alguns setores específicos. / The Generalized System of Preferences (GSP), main example of the preferential tariff concessions offered unilaterally by developed countries, has been used by developing countries for more than 30 years. The U.S. GSP, one of the most important programs to Brazil, has been causing some apprehension due to threats made by the U.S. to exclude this country from the program. Furthermore, the constant possibility of a program restructure at the moment of its renewal brings hesitation to the exporting sector that fears to suffer a great loss. This study was structured with the intention to estimate the loss to the Brazilian exports to the U.S. if Brazil is excluded from the list of beneficiaries of GSP. Using a partial equilibrium model, the total effect on the exports was calculated through the effects of trade creation and trade diversion. The results imply a decrease of US$ 393 millions of exports destined to U.S. and this loss would be very much concentrated on a few specific sectors.

Coordenação de Aperfeiçoamento de Pessoal de Nível Superior / O Sistema Geral de Preferências (SGP), principal exemplo da concessão de preferências tarifárias unilaterais pelos países desenvolvidos, vem sendo usufruído pelos países em desenvolvimento há mais de 30 anos. O SGP dos EUA, um dos programas mais importantes para o país, vem recentemente sendo objeto de apreensão devido às ameaças que os EUA fez ao Brasil de retirá-lo do programa. Além disso, a possibilidade de uma reestruturação do programa no momento de sua renovação traz muita preocupação ao setor exportador que teme sofrer prejuízos. Este trabalho foi estruturado com o objetivo de estimar a perda das exportações brasileiras para os EUA se o Brasil for eliminado da lista dos países beneficiários do SGP. Usando uma metodologia de equilíbrio parcial, o efeito total sobre as exportações foi calculado através dos efeitos de criação e desvio de comércio. Os resultados indicam uma diminuição de aproximadamente US$ 393 milhões nas exportações destinadas aos EUA e essa perda estaria fortemente concentrada em alguns setores específicos. / The Generalized System of Preferences (GSP), main example of the preferential tariff concessions offered unilaterally by developed countries, has been used by developing countries for more than 30 years. The U.S. GSP, one of the most important programs to Brazil, has been causing some apprehension due to threats made by the U.S. to exclude this country from the program. Furthermore, the constant possibility of a program restructure at the moment of its renewal brings hesitation to the exporting sector that fears to suffer a great loss. This study was structured with the intention to estimate the loss to the Brazilian exports to the U.S. if Brazil is excluded from the list of beneficiaries of GSP. Using a partial equilibrium model, the total effect on the exports was calculated through the effects of trade creation and trade diversion. The results imply a decrease of US$ 393 millions of exports destined to U.S. and this loss would be very much concentrated on a few specific sectors.

A União Européia e os Estados Unidos são os dois maiores importadores e exportadores mundiais de produtos agroindustriais. O Brasil é um dos mais dinâmicos fornecedores mundiais destes produtos. O país detém a terceira posição no ranking dos maiores exportadores mundiais e apresenta, desde 2002, o maior superávit comercial agroindustrial do mundo. A UE e os EUA poderiam importar ainda mais se não impusessem proteções de fronteira para seus produtos sensíveis. Picos tarifários, tarifas proibitivas, escaladas tarifárias, tarifas específicas, quotas tarifárias e salvaguardas especiais são os mecanismos de proteção analisados neste trabalho. Embora dirigidas para uma minoria de produtos, essas proteções são de grande relevância para o Brasil. As barreiras tarifárias foram analisadas sob três perspectivas: (i) das relações entre as barreiras e as políticas de apoio ao setor agrícola na UE e nos EUA; (ii) da inserção dos produtos brasileiros nesses mercados e (iii) da aplicação de um modelo de equilíbrio parcial para simulação dos efeitos sobre as importações diante de cenários de redução tarifária. O modelo de equilíbrio parcial baseia-se na elasticidade-preço cruzada da demanda por importação. Foram simuladas duas situações: reduções de 50% e de 100% nas tarifas. O modelo foi executado para uma seleção de produtos que fosse, ao mesmo tempo, sensíveis para UE e EUA, e de interesse do Brasil. Os seguintes setores foram analisados: açúcar e álcool, carne bovina, carne de frango, carne suína, suco de laranja, café torrado e solúvel, óleo de soja e fumo em folhas. Os resultados agregados mostram que as importações norte-americanas cresceriam 94% em valor (US$ 4,8 bilhões) e as européias 55% (€ 3,1 bilhões) para o cenário de 100% de redução tarifária. O modelo permite concluir que, caso as proteções de fronteira fossem efetivamente reduzidas, ambos os mercados demandariam volumes significativamente maiores de produtos que são exportados pelo Brasil. Conclui-se também que acordos de livre comércio como a Área de Livre Comércio das Américas (ALCA) e o Acordo UE-Mercosul, bem como as negociações multilaterais, se promoverem a liberalização dos mercados agrícolas, trarão ganhos inegáveis de comércio para o agronegócio brasileiro. / The European Union and the United States are the two largest world importers and exporters of agricultural products. Brazil is one of the most dynamic supplier of those commodities. Among the main agricultural exporters, Brazil is the third one and, since 2002, the country has had the largest agroindustrial trade balance surplus in the world. The EU and US would import even more if they were not allowed to impose border protection on their sensitive products. Tariff peaks, prohibitive tariffs, specific tariffs, tariff escalation, tariff quotas, and especial safeguards are the mechanisms analyzed by this work. Although these restrictions protect a small amount of products, their impact is huge on Brazil. The tariffs barriers were analyzed in three perspectives: (i) of the relations between the European and North-American policies to protect their agricultural sector and the barriers imposed; (ii) of the performance of the Brazilian agricultural exports in the previously mentioned foreign markets, and (iii) concerning different tariff reduction scenarios, of the utilization of a partial equilibrium model to quantify the effects on agricultural. The partial equilibrium model is based on price elasticities of import demand with respect to domestic prices. Two tariff reduction scenarios were simulated: 50% reduction and 100% reduction. The simulation model were run for a selection of products. Only products that could be considered not only sensitive for EU and US, but also relevant for Brazilian exports were selected. Sugar and ethanol, bovine meat, poultry meat, swine meat, orange juice, roasted coffee, instant coffee, soybean oil and unmanufactured tobacco were the sectors analyzed. The aggregated results show that the US imports would increase 94% (4,8 US billion) and EU imports 55% (3,1 € billion), in the case of 100% tariff reduction. The modeling results lead to the conclusion that, in the case of effective border protection reduction, both markets would demand higher quantity of products that are exported by Brazil. If agreements between the Free Trade Area of Americas and the EU-Mercosur, as well as the multilateral negotiations, end up promoting agricultural market liberalization, Brazilian agribusiness will profit enormously in terms of its trade.

This thesis deals with the economic and environmental problems of biofuels in the Czech Republic and abroad. The goal is retrieval and analysis of economic studies that address economic and environmental impacts associated with the introduction of biofuels policy. Individual economic studies on the environment that are at work that are evaluated by using biofuels policy of macroeconomic and microeconomic models. Results of studies show that the introduction of biofuels policy creates economic and environmental impacts such as deforestation, environment, prices, employment and competitiveness of farmers.

Agricultural input expenditures have not been widely incorporated in most partial equilibrium models. Thus, investigating the effect of economic policies and other exogenous factors on the agricultural sector will produce only a partial analysis, since the simultaneous impact of these factors on input expenditures is excluded. This study, therefore, extends the existing partial equilibrium multi-market model of the South African agricultural sector (BFAP model) by incorporating agricultural input expenditure. Thus, the analysis of the impact of economic policies on the agricultural sector, which was limited only on the gross income (production, area planted and prices), has now been extended to assess their effects on input expenditures, gross value added and net farming income of the sector. In addition, the analysis is further extended to evaluate the financial and economic position of the agricultural sector by investigating the implications of the policies on the asset and debt values of the sector. The comparative result obtained from the shocks of a crude oil and world fertiliser price rise shows that due to the inclusion of the recursive effect from the output to input side of the sector and vice versa and endogenising input costs, the effect of the shock on gross value added and net farming income converges slowly and cyclically in the recursively linked model, compared to the unlinked model, in which the effect abruptly halts after a single year. Thus, the recursively linked integrated model replicates the dynamics experienced by the agricultural sector better than the recursively unlinked integrated model. In addition, the endogenisation of domestic input costs on the integrated model allows a comprehensive analysis of the effect of macroeconomic variables on the agricultural sector by considering their impact on both outputs and inputs. Thus, using the recursively linked model, a fifty percent devaluation of exchange rate is assessed. The result showed that a depreciation of exchange rate resulted in a net benefit for the sector, as the gain from enhancing agricultural income outweighs the rise in expenditure. Excluding the simultaneous impact on input expenditure would have overestimated the benefit by looking only at its effect on gross income. The integrated model was also used to project a baseline for the South African agricultural sector’s main aggregate variables for the medium term (2010-2015) under the status quo of policy assumptions and forecast values of exogenous variables. The baseline projections of the gross income, intermediate input expenditure and gross value added show a modest average annual growth rate during the baseline period. The net farming income, however, depicts a relatively lower growth due to the general modest rise in agricultural gross income compared with total input expenditure. Based on the projected values of main aggregate variables, several financial and economic performance indicators for the agricultural sector are also projected. In general, the economic performance indicators of the sector, measured by the net return on the sector’s investment and equity, show good performance when compared with the average cost of borrowing during the baseline period. Thus, this study shows that integrating input expenditure in a multi-market output model by recursively linking both sides and endogenising domestic input costs would improve the result of the standard partial equilibrium by generating projections for several key aggregate variables, providing the net effect of economic policies on the agricultural sector and replicating the dynamics of the agricultural sector better than models that have few/no input components or that assess the effects separately and ignore the recursive linkage. Thus, this study provides a powerful modelling tool to be used by policy makers to comprehensively investigate the net effects of economic policies on the agricultural sector and to answer several ‘what if’ questions. / Thesis (DCom)--University of Pretoria, 2010. / Agricultural Economics, Extension and Rural Development / unrestricted

Agrarmärkte sind oft durch Unsicherheit gekennzeichnet - hervorgerufen vor allem durch Zufallsschwankungen in Angebot und Nachfrage. Das Ziel der vorliegenden Studie besteht darin, die Konsequenzen solcher Unsicherheiten für die Bewertung und Gestaltung der vor einer grundlegenden Neuausrichtung stehenden EU-Milchmarktpolitik zu untersuchen. Zunächst legen empirische Betrachtungen anhand der Zeitreihen verschiedener Marktgrößen nahe, dass Unsicherheit für die Akteure auf dem EU-Milchmarkt tatsächlich ein relevantes Phänomen ist. So sind etwa Preisschwankungen trotz der auf eine Marktstabilisierung ausgerichteten staatlichen Eingriffe zu beobachten. Anhaltspunkte konnten auch zu den Ursachen der Marktunsicherheiten gewonnen werden. Während Angebot und Nachfrage in der EU eine eher stabile Entwicklung aufweisen, neigen die internationalen Milchproduktmärkte zu Fluktuationen. Zur Analyse der Auswirkungen staatlicher Eingriffe auf dem Milchmarkt bei Unsicherheit dient ein stochastisches partielles Marktgleichgewichtsmodell. Das Modell bildet die spezifischen Strukturen des Milchmarkts mit dem Rohmilchangebot, der Milchverarbeitung und der Nachfrage nach den verschiedenen Milchprodukten ab. Zur Integration von Unsicherheit wird die Modellstruktur um stochastische Variablen in den Angebots- und Nachfragefunktionen erweitert. Mit Quotenregelung, Zöllen und Exporterstattungen lassen sich wesentliche Politikinstrumente untersuchen. Gegenstand der Betrachtungen sind mögliche Auswirkungen einer neuen multilateralen Handelsvereinbarung im Rahmen der Welthandelsorganisation (WTO) sowie die Effekte dreier für den Milchmarkt formulierter Politikszenarien. Diese Politikoptionen sind die im Juni 2003 in Luxemburg beschlossene Agrarreform, eine in der Fachöffentlichkeit oft diskutierte Quotenkürzung und eine vollständige Liberalisierung des Milchmarkts samt Quotenabschaffung. Die Ergebnisse zeigen, dass veränderte Preis- und Mengeneingriffe nicht nur zu Verschiebungen im Niveau von Zielgrößen, wie beispielsweise von Erzeugerpreisen und Erlösen in der EU und auf Drittlandsmärkten führen, sondern ebenso zu veränderten Streuungen. Zusätzliche Einsichten vermitteln die Ergebnisse darüber hinaus bezüglich der Unsicherheit in der Planung der öffentlichen Ausgaben am Milchmarkt und in der Vorhersage der Wohlfahrtseffekte von Politikänderungen. Gegenüber einer deterministischen Betrachtung wird eine Politikanalyse am Milchmarkt unter expliziter Berücksichtigung von Unsicherheit damit komplexer und die Beurteilung von Politikoptionen differenzierter.

L’Analyse du Cycle de Vie (ACV) est une méthode d’évaluation multicritère des impacts environnementaux des biens et services. A ces débuts, l’ACV, dite Attributionnelle (ACVA), s’est attachée à analyser les impacts environnementaux dans des situations statiques pour la réalisation d’études comparatives, la communication environnementale et le développement de produits. De récents développements méthodologiques ont vu l’émergence de l’ACV Conséquentielle (ACVC) qui vise à quantifier les impacts directs et indirects de changements, via les mécanismes de marchés, permettant ainsi l’évaluation de politiques publiques. Cette thèse vise à proposer un cadre méthodologique pour l’évaluation d’instruments de politiques publiques dans le secteur de l’élevage laitier en combinant ACV et modèles économiquesElle s’articule autour de trois axes : i) identification et caractérisation des performances environnementale de technologies de production laitières par ACVA ; ii) adaptation du modèle économique MATSIM-LUCA pour les besoins de la thèse ; iii) évaluation par ACVC des impacts environnementaux de la suppression des quotas laitiers et de l’introduction d’une prime à l’herbe en Europe. Les travaux réalisés fournissent : i) une première proposition méthodologique pour l’évaluation d’instruments de politiques publiques par ACVC dans le secteur de l’élevage et ii) plusieurs pistes d’amélioration nécessaires pour rendre la méthode opérationnelle pour les décideurs publics. / Life Cycle Assessment (LCA) is a multicriteria method to assess environmental impacts of goods and services. In its early stages, LCA, known as Attributional (ALCA), was used to assess environmental impacts in a status-quo situation for benchmarking, environmental communication and product development. Recent methodological developments led to Consequential LCA (CLCA), which aims to quantify direct and indirect impacts of changes, through market mechanisms, allowing for public policy assessment. The aim of this Ph.D. thesis is to develop a methodological framework to assess public policy instruments in the livestock sector by combining LCA and economic modellingThis thesis is organized into three axes: i) identification and characterization of environmental performances of dairy production technologies through ALCA; ii) adaptation of MATSIM-LUCA economic model to the needs of the thesis; iii) environmental impact assessment through CLCA of dairy quota removal and implementation of a grass premium in the European Union. This work provides i) initial development of a methodological framework for assessing public policy instruments in the livestock sector and ii) identification of several improvements needed to make the method operational for stakeholders.