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  • Relative importance, of cues underlying Spanish consumers' beef choice and segmentation, and consumer liking of beef enriched with n-3 and CLA fatty acids

     Realini, C.E; Kallas, Zein; Perez Juan, M; Gomez, I.; Olleta, J.L; Beriain, M.J; Alberti, P.; Sanudo, C
    Food quality and preference
    Date of publication: 2014-04-01
    Journal article

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    The choice experiments technique was used to estimate the relative importance of some of the main attributes of beef; origin (locally produced, other Spanish origin), animal diet (conventional, enriched with n-3, with CLA, or with n-3 plus CLA), amount of visible fat (slight, moderate), meat colour (bright red, pale red), and price (6.6, 5.7, 4.8 and 3.9 (sic) per tray containing 0.3 kg of beef loin) in three Spanish cities (Barcelona, Pamplona, Zaragoza) with 322 individuals. Consumer segments with similar preference profiles of beef choices were identified using the Latent Class model. Consumer liking of beef enriched with n-3 and/or CLA fatty acids was also evaluated by the same consumers. The most important cue driving the majority of consumers' beef purchase decisions was the amount of visible fat (36%) followed by price (25%), then colour (19%) and origin (17%), and finally animal diet (4%) which was not important. Most consumers preferred beef with a slight content of visible fat, medium-low price, locally produced and bright red colour. Segmentation analysis revealed three consumer profiles: 'health conscious consumers' with preference for lean beef (consumers: older, women, retired, housewives, greater food expenditure and more concerned with health); 'price-oriented consumers' with preference for lowest priced beef (consumers: younger, students, higher education, lower beef intake and purchase at supermarket); and 'quality-oriented consumers' with preference for beef with moderate amount of visible fat (consumers: men, from Barcelona). Consumers were willing to pay a premium of 1.21, 1.52 and 2.04 (sic) over 14 (sic)/kg for CLA, n-3 and n-3 plus CLA enriched beef, respectively. 'Health conscious consumers' were more willing to pay and more likely to purchase enriched beef with beneficial fatty acids. The individual beef enrichment with n-3 or CLA improved consumer liking scores, while the combined enrichment with n-3 plus CLA offered no hedonic advantages over conventional beef. (C) 2013 Elsevier Ltd. All rights reserved.

  • Effect of tasting and information on consumer opinion about pig castration

     Kallas, Zein; Gil Roig, Jose Maria; Panella Riera, Nuria; Blanch, Marta; Font i Furnols, Maria; Chevillon, Patrick; De Roest, Kees; Tacken, Gemma; Oliver Pratsevall, Maria Angels
    Meat science
    Date of publication: 2013-06-12
    Journal article

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    Our research explored the relative importance of pig castration amongst other aspects of animal welfare, and the potential impact of information and sensory experiences on European Union (EU) consumers' preferences. The EU is considering a future ban on surgical pig castration by 2018 which may affect markets and consumers' preferences. We carried out an empirical study using consumer-level data obtained from questionnaires completed in a controlled environment by a total of 825 consumers. The experiment was carried out in six EU countries (Spain, United Kingdom, The Netherlands, France, Italy and Germany) which account for 66.0% of the EU-27's and 76.3% of the EU-15's meat production. Results show that consumers do not perceive pig castration to be a relevant aspect of animal welfare nor its relationship with meat quality. Consumers with healthy life styles, concerned about animal welfare and who have had a negative sensory experience with boar meat are willing to accept paying more to avoid boar taint.

  • Analysis of consumer's preferences for a special-occasion red wine: A dual response choice experiment approach

     Kallas, Zein; Escobar González, Cristina; Gil Roig, Jose Maria
    Food quality and preference
    Date of publication: 2013-12
    Journal article

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    We analysed the heterogeneity of consumers' preferences toward a red wine for a special occasion in Catalonia (Spain). The empirical analysis included a survey of 400 consumers. A variation of the "dual response choice experiment" (DRCE) design, which allows the simultaneous analysis of what consumers "would prefer" (first stage of the DRCE) and what they "would purchase" (second stage of the DRCE) was implemented using the heteroscedastic extreme value (HEV) model. The results show that the most preferred attributes are wines of Catalan origin, wines made with the Cabernet Sauvignon grape variety, and wines that have been previously experienced by the consumer. The ordering of the attributes was not affected by whether the choice of purchase was forced. Nevertheless, the results from the non-forced choice experiment exhibited an increasing tendency of welfare estimates for the most preferred attributes and levels

  • Information impact on consumers¿ preference towards beef meat enriched with polyunsaturated fatty acids (omega-3 and conjugated linoleic acid)

     Kallas, Zein; Realini, C.E; Gil Roig, Jose Maria
    EAAE Seminar. Workshop on Valuation Methods in Agro-food and Environmental Economics
    Presentation's date: 2013-06-27
    Presentation of work at congresses

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    This paper uses a hypothetical Choice Experiments (CE) to investigate Spanish consumers¿ preferences towards beef meat enriched with polyunsaturated fatty acids (omega-3 and conjugated linoleic acid. Data are gathered from self-completed questionnaires in a controlled environment with two different samples (320 and 322 consumers) differentiated by the information received. The surveys were carried out in three main Spanish cities (Barcelona, Zaragoza and Pamplona). We used a variation of the ¿Dual Response Choice Experiment¿ (DRCE) design due to its ability to emphasis the purchase context. The preliminary results showed that consumers who received information attach higher preferences value to enriched meat with polyunsaturated fatty acids. The utility associated with the moderate content of fat increase for informed consumers, showing a substitute effect. Informed consumers are willing to accept meat with visible fat if it is enriched

  • Measuring the social value of agriculture

     Kallas, Zein
    Sustainable Human Development for MED Countries Seminar
    Presentation's date: 2013-06-05
    Presentation of work at congresses

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    Agricultural multifunctionality is the recognition of the joint exercise of economic, environmental, and social functions by the agricultural sector. In order to make the concept operative for the design of public policies, it is necessary to estimate the social demand for such functions. The main objective of this article is to present an empirical application in this sense. For this purpose, we have adopted the agricultural system of cereal steppes in Tierra de Campos in Spain as a case study. The economic valuation technique used is the Choice Experiment. The results suggest the existence of a significant demand for the different functions, although the demand is heterogeneous, depending on the socioeconomic characteristics of the individuals surveyed.

  • Consumers¿ wine preferences depending on the occasion of consumption: A case study in Catalonia

     Escobar Gonzalez, Cristina; Kallas, Zein; Gil Roig, Jose Maria
    Workshop on Valuation Methods in Agro-food and Environmental Economics
    Presentation's date: 2013-06-28
    Presentation of work at congresses

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    The main objective of this paper is the determination of consumers¿ wine preferences depending on the occasion of consumption in Catalonia (Spain). A special attention is paid to the origin of the wine. To fulfil our goal a survey with 400 wine consumers is implemented. Methodologically, two Choice Experiments have been applied within a sample in order to compare results from two different occasions of consumption; a regular and a special occasion. We used a variation of the ¿Dual Response Choice Experiment¿ (DRCE) design due to its ability to emphasis the purchase context and the Random Parameter Logit (RPL) model which relaxes the IIA restriction. The preliminary results suggest that consumers¿ preferences differ according to the occasion of consumption, especially regarding to the price.

  • Does sensory experience influence European consumers¿ preferences for animal-compassionate meat? A case study related to pig castration

     Kallas, Zein; Gil Roig, Jose Maria; Panella Riera, Nuria; Blanch, Marta; Font i Furnols, Maria; Chevillon, Patrick; De Roest, Kees; Tacken, Gemma; Oliver, M. Àngels
    Congreso de Economía Agraria
    Presentation's date: 2013-09-05
    Presentation of work at congresses

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  • Impacto del análisis sensorial sobre las preferencias de compra de los consumidores

     Kallas, Zein
    Jornada anual NEXT_SENSES
    Presentation's date: 2013-11-14
    Presentation of work at congresses

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    Durante la acción de COMPRA de los productos agroalimentarios, los consumidores generalmente se enfrentan a un complejo proceso de decisión debido a muchas características que incluye varias opciones y alternativas. Tal complejidad también confunde la determinación de los factores que afectan el consumo y la toma de decisiones de compra. ¿En qué nos fijamos cuando adquirimos productos alimentarios?

  • El diseño de doble respuesta en los experimentos de elección (DREE)

     Kallas, Zein; Escobar Gonzalez, Cristina; Gil Roig, Jose Maria
    Date of publication: 2013
    Book chapter

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  • Valoración económica de la agrobiodiversidad

     Kallas, Zein; Gil Roig, Jose Maria
    Date of publication: 2012
    Book chapter

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    How important are cultural and environmental objectives for rice farmers in South Senegal?  Open access

     Kallas, Zein; Baba, Yasmina; Rabell, Cristina
    International Conference of the International Association of Agricultural Economists
    Presentation's date: 2012-08-22
    Presentation of work at congresses

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    Advertisement impact on consumers¿ preferences: a choice experiment approach  Open access

     Kallas, Zein; Escobar Gonzalez, Cristina; Gil Roig, Jose Maria
    Workshop on Valuation Methods in Agro-food and Environmental Economics
    Presentation's date: 2012-07-12
    Presentation of work at congresses

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    El Calendari d¿Atenea versus ¿Google calendar¿. Sinergia  Open access

     Kallas, Zein; Ornat Longarón, César
    Dia Atenea
    Presentation's date: 2012-06-15
    Presentation of work at congresses

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  • Cuestionarios Moodle como herramienta transversal de aprendizaje

     Masalo Llora, Ingrid; Kallas, Zein; Almirall Malivern, Antonio Rafael; Ornat Longarón, César; Achaerandio Puente, Maria Isabel
    Congrés Internacional de Docència Universitària i Innovació
    Presentation's date: 2012-07-05
    Presentation of work at congresses

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    Moodle, Web 2.0 & ¿Iframe¿  Open access

     Ornat Longarón, César; Kallas, Zein
    International Technology, Education and Development Conference
    Presentation's date: 2012-03-06
    Presentation of work at congresses

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  • Assessing the impact of a Christmas advertisement campaign on Catalan wine preference using Choice Experiments

     Kallas, Zein; Escobar González, Cristina; Gil Roig, Jose Maria
    Appetite
    Date of publication: 2012
    Journal article

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  • Facing new EU policies towards animal welfare improvement. The relative importance of pig castration

     Kallas, Zein; Gil Roig, Jose Maria; Panella Riera, Nuria; Blanch, Marta; Tacken, Gemma; Chevillon, Patrick; De Roest, Kees; Oliver Pratsevall, Maria Angels
    Eurochoices
    Date of publication: 2012-12
    Journal article

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  • How important are cultural and environmental objectives for rice farmers in South Senegal?

     Kallas, Zein; Baba, Yasmina; Rabell, Cristina
    New Medit
    Date of publication: 2012
    Journal article

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  • The productive efficiency of organic farming. The case of grape sector in Catalonia

     GUESMI, Baouli; Serra Devesa, Teresa; Kallas, Zein; Gil Roig, Jose Maria
    Spanish journal of agricultural research
    Date of publication: 2012
    Journal article

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  • Què, qui, com... als mercats de Barcelona

     Kallas, Zein; Barco Guijarro, Maria Carmen; Moneo, Marta; Andrino, Paulina
    Informacions
    Date of publication: 2012
    Journal article

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  • Catalonia consumers prefer wild mussels. Study Finds Knowledge Of Mussel Farming Limited

     Escobar Gonzalez, Cristina; Kallas, Zein; Gil Roig, Jose Maria
    The Global Aquaculture Advocate
    Date of publication: 2012
    Journal article

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    Technological or tradicional tools for documents correction? A Case study in higher education  Open access

     Kallas, Zein; Ornat Longarón, César
    Journal of technology and science education
    Date of publication: 2012
    Journal article

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  • Consumer preferences for organic food: Behavior building-up, importance of pricing, information and sensory issues  Open access

     Avitia Rodríguez, Jessica Alejandra
    Defense's date: 2012-07-04
    Institute for Research on Science and Technology for Sustainability, Universitat Politècnica de Catalunya
    Theses

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    The aim of this thesis is to investigate Spanish consumers purchase motivations and behavior towards organic food by means of determining the key factors that take part on building their behavior. An important contribution of this work consists on providing more evidence on consumers’ underlying motivations to buy organic food for the particular case of Spain and to test the role of sensory “experience” in defining individual new WTP for a post purchasing situation. This thesis investigates the role of personal, economic and social elements in predicting Spain consumers’ attitudes and purchase intentions toward organic food. It place together all the relevant variables identified by previous studies developing a new and complex behavioral model on consumers’ organic decision making process. The new conceptual model is developed and tested via structural equation modeling. Results show that attitudes, knowledge, as well as environmental and health concern partially mediates the effects of trust in market agents and risk perceptions on attitudes toward organic food. Furthermore, price and subjective norms have been detected to explain organic food purchase intention. Next, this thesis analyzes the factors affecting consumer’s willingness to pay (WTP) for organic food. In this context, the most widely used valuation methods have been Conjoint Analysis and Choice Experiments. However, discrete choice and conjoint data do not offer immediate financial consequences for the participants. As a consequence, consumers tend to overestimate their real WTP. For that reason, this thesis investigates approaches to incorporate incentives into the traditional conjoint and choice methodologies. In this research, we analyze the “Calibrated Auction-Conjoint Valuation method” (CACM), by comparing Non-adjusted values from a self-explicated conjoint method to the final calibrated values entered using a non-hypothetical auction in a context well suited to the CACM: preferences for sustainable farming. We noticed that consumers significantly reduced their WTP when moving from the initial stage of the CACM to the final stage, primarily by placing less importance on product prices, implying that WTP values from a self-explicated conjoint method used alone would likely lead to overstated estimates of WTP. Finally, consumers’ willingness to pay and sensory “experience” is assessed through an experimental auction. Two auctions have been designed: the first consists on consumers’evaluation of different food options based on search attributes (before purchase) and the second after tasting it (simulating a post purchasing situation). In between a hedonic sensory test is performed. Simultaneously, as a complementary exercise, a trained panel sensory test has been employed to identify the main organoleptic characteristics that consumers associate with the hedonic taste satisfaction. Finally, factors affecting consumers’ WTP differences in the two auctions are analyzed. We have detected that the Spanish consumers have a positive attitude towards sustainable food due to environmental concerns, health concerns, and trust in certification and market agents. However, the premium they are willing to pay for these products is lower than the current market price. Furthermore, both “search” and sensory “experience” do influence consumers’ purchase behavior.

    El objetivo de esta tesis es investigar las motivaciones de compra de los consumidores españoles y el comportamiento hacia los alimentos ecológicos por medio de la determinación de factores clave que intervienen en la construcción de su comportamiento. Una contribución importante consiste en proporcionar más evidencia a la ya existente en España sobre las motivaciones subyacentes de los consumidores para comprar alimentos ecológicos, así como determinar el rol de la experiencia sensorial en la generación de las nuevas disposiciones a pagar una vez comprado el producto. En esta tesis se investiga el papel de elementos personales, económicos y sociales en la predicción de las actitudes e intenciones de compra hacia los alimentos ecológicos de los consumidores de España. Se sitúan todas las variables identificadas en estudios previos desarrollando un complejo modelo del comportamiento de los consumidores de alimentos ecológicos en el proceso de toma decisión. Un modelo conceptual es desarrollado y probado a través de modelos de ecuaciones estructurales. Los resultados muestran que las actitudes de conocimiento, así como la preocupación del medio ambiente y la salud media parcialmente los efectos en la confianza en los agentes del mercado y las percepciones de riesgo a las actitudes hacia los alimentos ecológicos. Por último, las normas subjetivas y el precio explican la intención de compra. Además en esta tesis se analizan los factores que afectan la disposición a pagar de los consumidores alimentos ecológicos. En este contexto, los métodos de valoración más utilizados han sido el análisis conjunto y experimentos de elección. Sin embargo, la elección discreta y el conjunto de datos no ofrecen consecuencias financieras inmediatas para los participantes. Como consecuencia, los consumidores tienden a sobreestimar su verdadera disposición a pagar. Debido a lo anterior, esta tesis estudia métodos para incorporar incentivos en las metodologías tradicionales de elección y el conjunto de datos. En esta investigación se analiza el “Calibrated Auction-Conjoint Valuation Method” (CACM), mediante la comparación de los valores no ajustados a partir de un método conjunto auto-explicado a los valores finales calibrados participando en una subasta hipotética, en un contexto muy adecuado para el CACM: las preferencias para la agricultura sostenible. Hemos encontrado que los consumidores redujeron significativamente su disposición a pagar cuando se pasa de la etapa inicial del CACM a la etapa final, principalmente mediante la asignación de menor importancia en los precios de los productos, lo que implica que los valores de la disposición a pagar de utilizando solamente un método de auto-explicado conjunto podría llevar a estimaciones exageradas de la disposición a pagar. Por último, la disposición a pagar de los consumidores se determina mediante una subasta experimental. Dos subastas se han diseñado: la primera consiste en la evaluación de los consumidores de las opciones de diferentes alimentos en función de atributos de búsqueda (antes de la compra) y el segundo después de probarlo (simulando una situación postcompra). Entre las dos apuestas se lleva a cabo una prueba sensorial hedónica. Al mismo tiempo, como un ejercicio complementario, una prueba sensorial con un panel entrenado se realizó para identificar las principales características organolépticas que los consumidores asocian con la satisfacción hedónica del gusto. Finalmente, para determinar los factores que afectan las diferencias en la disponibilidad a pagar de los consumidores se analizan dos subastas. Se encontró que los consumidores españoles tienen una actitud positiva hacia la comida producida de manera sostenible debido a las preocupaciones ambientales, problemas de salud, y la confianza en la certificación y los agentes del mercado. Sin embargo, la prima que están dispuesto a pagar por estos productos es menor que el precio del mercado actual. Por otra parte, existe una la influencia clara de los atributos intrínsecos del producto (tipo de producción, etc), y la “experiencia” sensorial en el comportamiento de compra del consumidor.

  • An assessment of the impacts of recent food market shocks on food prices using price transmission analysis  Open access

     M. I. k. hassouneh, Islam
    Defense's date: 2012-02-29
    Institute for Research on Science and Technology for Sustainability, Universitat Politècnica de Catalunya
    Theses

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    Los mercados mundiales agroalimentarios se han visto recientemente afectados por shocks importantes tales como crisis alimentarias y el estallido del mercado de los biocombustibles. La presente tesis contribuye de forma significativa a la literatura existente sobre la transmisión de precios, analizando los impactos que estos shocks de mercado han tenido sobre los niveles de precios de los alimentos y la estabilidad de los mismos. Para ello se aplican modelos de econometría de series temporales recientemente desarrollados. La tesis estudia tres cuestiones principales en tres artículos científicos, que constituyen el elemento central de la misma. En el primer artículo, un modelo de corrección del error de cambio de régimen se aplica a series de precios mensuales para determinar el impacto de la crisis de la EEB sobre la dinámica de los precios del bovino a lo largo de la cadena comercial en España. Diferentes regímenes dentro del modelo representan diferentes comportamientos de precios ante distintas condiciones de mercado. Para esclarecer si el efecto de la EEB sobre la transmisión vertical de precios depende de la magnitud de la crisis, se construye un índice de información sobre la EEB que se utiliza para determinar el cambio de régimen. Los resultados sugieren que la crisis de la EEB afecta a los productores de carne y a los minoristas de forma diferente. Mientras que los precios al consumo no se ajustan ante la crisis, los precios al ganadero sí que lo hacen. La magnitud del ajuste depende de la magnitud de la crisis de la EEB. En el segundo artículo, un modelo bivariante de corrección del error de transición suave se aplica al estudio de los precios mensuales de las aves de corral para analizar los efectos que la gripe aviar ha tenido sobre la transmisión de los precios a lo largo de la cadena comercial de aves en Egipto. Al igual que en el artículo anterior, se construye un índice para reflejar el nivel de información que los consumidores tienen sobre la crisis, el cual se utiliza en el modelo como variable de transición entre distintos regímenes. Si bien los índices de información se han utilizado ampliamente para estudiar los impactos de las crisis alimentarias en los países desarrollados, este trabajo es el primero en utilizarlos para estudiar los efectos de estas crisis en países en vías de desarrollo. Nuestros resultados sugieren que los ajustes de precios ante desequilibrios del mercado dependen de la magnitud de la crisis de la gripe aviar. Además, estos ajustes tienen consecuencias muy diferentes para el equilibrio del mercado: durante la crisis los minoristas utilizan su poder de mercado para aumentar los márgenes de comercialización. Por el contrario, los márgenes del mayorista disminuyen. Los resultados también sugieren que los índices de información sobre las crisis contribuyen a una mejor comprensión de los efectos económicos de las mismas en los países en desarrollo.

    Food markets worldwide have been strongly affected by recent shocks such as food scares and the outbreak of the biofuels market. The present thesis makes a significant contribution to the existing literature on price transmission by shedding light on the impacts that these food market shocks have had on food price levels and stability. To do so, recent developments in time series econometrics are applied. Three specific objectives have been pursued in three papers that constitute the main body of the dissertation. In the first paper, a regime-switching vector error correction model is applied to monthly price data to assess the impact of BSE outbreaks on price relationships and patterns of transmission among farm and retail markets for bovine in Spain. Different regimes within the model represent different price behavior under different market conditions. To evaluate whether different magnitudes of the BSE food scare elicit different food price responses, a BSE food scare information index is developed and used as the variable determining regime-switching. Results suggest that BSE scares affect beef producers and retailers differently. While consumer prices are not found to respond to BSE scares, producer prices are adjusted as a response to the crisis. The magnitude of the adjustment is found to depend on the magnitude of the food scare. In the second paper, a bivariate smooth transition vector error correction model is applied to monthly poultry price data to analyze the effects that avian influenza has had on price transmission along the Egyptian poultry marketing chain. As in the previous paper, in order to reflect consumer awareness of the crisis, an avian influenza food scare information index is developed and used within the model as a transition variable. While food scare information indices have been used to assess the economic impacts of food scares on developed countries, ours is the first attempt to use them in the context of a developing country. Our results show that price responses to deviations from the market equilibrium parity depend on the magnitude of the avian influenza crisis. Further, these adjustments are found to have very different implications for market equilibrium: during the crisis retailers use their market power to increase marketing margins. In contrast, wholesaler margins are found to decline. Results also suggest that food safety information indices contribute to a better understanding of the economic effects of food scare crises in developing countries. In the last paper, error correction models estimated both using multivariate local linear regression and conventional parametric techniques are applied to assess price linkages and price transmission patterns between food and energy prices in Spain. More specifically, the models study the links between biodiesel, sunflower and crude oil prices. Results suggest the existence of a longrun, equilibrium relationship between the three prices studied. Biodiesel is the only variable that adjusts to deviations from this long-run relationship. Local linear regression techniques show that the speed of adjustment of biodiesel prices is faster when biodiesel is relatively cheap than when it is expensive. Energy prices are found to influence sunflower oil prices through short-run price dynamics.

  • Estudi de Posicionament dels Productes Aqüícoles Catalans per part del Consumidor a Catalunya

     Escobar González, Cristina; Kallas, Zein; Gil Roig, Jose Maria
    Date of publication: 2012-05-31
    Book

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  • Effects of policy instruments on farm investments and production decisions in the spanish COP sector

     Kallas, Zein; Serra Devesa, Teresa; Gil Roig, Jose Maria
    Applied economics
    Date of publication: 2012-10
    Journal article

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  • Impact of consumer's sensitivity to androstenone on acceptability of meat from entire male pigs in three European countries: France, Spain and United Kingdom

     Blanch, Marta; Panella Riera, Nuria; Chevillon, Patrick; Font i Furnols, Maria; Gil Farre, Marta; Gil Roig, Jose Maria; Kallas, Zein; Oliver Pratsevall, Maria Angels
    Meat science
    Date of publication: 2012
    Journal article

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    A Dual response choice experiments (DRCE) design to assess rabbit meat preference in Catalonia: A Heterocscedatistic extreme-value model  Open access

     Kallas, Zein; Gil Roig, Jose Maria
    Congress of the European Association of Agricultural Economists
    Presentation's date: 2011-09-02
    Presentation of work at congresses

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    Butchers¿ preferences for rabbit meat; AHP Pairwise comparisons versus a LIKERT scale valuation  Open access

     Kallas, Zein
    International Symposium on the Analytic Hierarchy Process
    Presentation's date: 2011-06-16
    Presentation of work at congresses

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    Consumers¿ preference for mussel consumption in Catalonia: A choice experiment approach  Open access

     Escobar Gonzalez, Cristina; Kallas, Zein; Gil Roig, Jose Maria
    Congreso Nacional de Acuicultura
    Presentation's date: 2011-11-23
    Presentation of work at congresses

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  • Web 2.0: de què parlem?

     Kallas, Zein
    Jornada Moodle-Atenea
    Presentation's date: 2011-02-04
    Presentation of work at congresses

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  • What to use? Technological or traditional tools for documents¿ correction? The students decide

     Kallas, Zein
    International Conference of Education, Research and Innovation
    Presentation's date: 2011-11-16
    Presentation of work at congresses

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    Decomposing the value of rabbit meat. A joint use of the contingent valuation and the analytical hierarchy process  Open access

     Kallas, Zein; Gil Roig, Jose Maria
    International Symposium on the Analytic Hierarchy Process
    Presentation's date: 2011-06-16
    Presentation of work at congresses

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    ¿Cuánto vale la agrobiodiversidad?  Open access

     Gil Roig, Jose Maria; Kallas, Zein
    Seminario Internacional sobre Agrobiodiversidad
    Presentation's date: 2011-11-04
    Presentation of work at congresses

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  • Combining contingent valuation with the analytical hierarchy process to decompose the value of rabbit meat

     Kallas, Zein; Gil Roig, Jose Maria
    Food quality and preference
    Date of publication: 2011-12-07
    Journal article

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  • A stated preference analysis comparing the Analytical Hierarchy Process versus Choice Experiments

     Kallas, Zein; Lambarraa, Fatima; Gil Roig, Jose Maria
    Food quality and preference
    Date of publication: 2011-03
    Journal article

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    El Proceso analítico jerárquico, comparativa con los experimentos de elección  Open access

     Kallas, Zein; Gil Roig, Jose Maria
    Workshop de Valoración Agraria
    Presentation's date: 2010-11-25
    Presentation of work at congresses

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    Technical efficiency and firm exit in the wine and meat sector: policy implications  Open access

     Kallas, Zein; Lambarraa, Fatima
    New Medit
    Date of publication: 2010-06
    Journal article

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    Farmers¿ objectives as determinants of organic farming adoption: the case of Catalonian vineyard production  Open access

     Kallas, Zein; Serra Devesa, Teresa; Gil Roig, Jose Maria
    Agricultural economics
    Date of publication: 2010-08-26
    Journal article

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  • Policy impact on technical efficiency of Spanish olive farms located in less-favored areas

     Lambarraa, Fatima; Kallas, Zein
    Acta agriculturae scandinavica. Section C, food economics
    Date of publication: 2010-12-07
    Journal article

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    The olive sector has an important social, economic, and environmental role in Spain. This production activity is distinguished by a large number of small farms, located mainly in less-favored areas (LFA). The main objective of this study is to analyze the determinant factor of farms’ technical efficiency as well as the impact of LFA payment on such efficiency. To achieve this objective, we used a Stochastic Frontier approach and a random-effect Tobit regression. A two balanced panel data sample of Spanish olive farms observed from 2000 to 2004 is obtained from the Farm Accountancy Data Network dataset. Results show that technical efficiency scores seem to be positively correlated with farm size, and age of manager, and negatively to farm renting cultivated land. The workforce composition shows that farms with a higher proportion of family labor, not receiving payments are more efficient relative to the farms with a higher proportion of remunerated work. The results also suggest a negative direct impact of the LFA aid scheme on the technical efficiency of LFA olive farms.

  • Analytical hierarchy process versus the choice experiments: a stated preference analysis  Open access

     Kallas, Zein; Lambarraa, Fatima; Gil Roig, Jose Maria
    International Symposium on the Analytic Hierarchy Process
    Presentation's date: 2009-07-31
    Presentation of work at congresses

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    Farmer¿s objectives as determinant factors of organic farming adoption  Open access

     Kallas, Zein; Serra Devesa, Teresa; Gil Roig, Jose Maria
    European Association of Agricultural Economists Seminar 1
    Presentation's date: 2009-09-04
    Presentation of work at congresses

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    Subsidies and technical efficiency: an application of stochastic frontier and random-effect Tobit models to LFA Spanish olive farms  Open access

     Lambarraa, Fatima; Kallas, Zein
    European Association of Agricultural Economists (EAAE). Seminar
    Presentation's date: 2009-09-04
    Presentation of work at congresses

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    The most of Spanish olive farms are concentrated in Less-Favoured Areas (LFA) with the majority of producer areas are under Objective 1 of the EU Regional Policy. The EU has long recognized such distinctive characteristics of those holdings with a specific support measures aiming to prevent the abandonment of olive groves as well as to support sustainable development of this sector. The main objective of this study is to evaluate the impact of LFA payment on the olive farms technical efficiency. Two sample farms located in LFA (63 farms receiving LFA payment support and 99 farms do not) have been observed from 2000 to 2004. A stochastic frontier production and Random-effect Tobit models have been used. Results indicate that LFA payment, age of manager, workforce composition and farm size affect efficiency levels. The LFA payment coefficient indicates a significant negative impact on the technical efficiency of Spanish olive farms. Farms that not receive LFA payment has a technical efficiency rate 0.15 percentage units upper compared to those that receive this payment.

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    Duration analysis to analyze factors leading wine and processed meat agro-industries to abandon their activities: policy implications.  Open access

     Kallas, Zein; Lambarraa, Fatima
    The 27th Conference of the International Association of Agricultural Economists
    Presentation's date: 2009-08-19
    Presentation of work at congresses

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    A choice experiment method to assess vegetables producers' preferences for crop insurance  Open access

     Mercadé, Lluc; Gil Roig, Jose Maria; Kallas, Zein; Serra, Jordi
    European Association of Agricultural Economists Seminar 1
    Presentation's date: 2009-09-05
    Presentation of work at congresses

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    Analytic hierarchy process versus the choice experiments: a stated preference analysis  Open access

     Kallas, Zein; Lambarraa, Fatima; Gil Roig, Jose Maria
    the 10th International Symposium on the Analytic Hierarchy / Network Process Multi-criteria Decision Making
    Presentation's date: 2009-07-31
    Presentation of work at congresses

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    Our paper tries to compare individuals’ preferences for attributes and levels of an agro-food product using two different methodologies. A key question is to know if asking consumer what they “prefer” or what they “buy” would lead to different results. In this context we realized an empirical comparison using two different methodologies; the Choice Experiments (CE) and the Analytical Hierarchy Process (AHP). The use of both methods is justified by their capacity to simulate the “purchasing” and “theoretical” stated preferences respectively. Restaurateur’s preference to include rabbit meat in their menus in Catalonia (Spain) has been taken to realize an exploratory study. At the aggregated results, attributes and levels preferences are found to be similar with a 55.6% of a correct rank score from both methods.

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    Farmer's objectives as determinant factors of organic farming adoption  Open access

     Kallas, Zein; Serra Devesa, Teresa; Gil Roig, Jose Maria
    European Association of Agricultural Economists (EAAE). Seminar
    Presentation's date: 2009-09-04
    Presentation of work at congresses

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