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The Spanish aquaculture sector has undergone a rapid and continuous growth becoming one of the biggest European producers. Awide range of species are farmed and, among them, the sea bass, sea bream and turbot make a signi¢cant contribution to the total of the Spanish ¢sh farming output. In this paper, we analyse and predict the medium-term trend of the production and price level for the three leading species previously mentioned. The results obtained show a signi¢cant increase in the production of sea bream, sea bass and turbot. The results show also a slight decrease in the sea bream average price, a stable trends for the sea bass and increasing prices for the turbot.

En este artículo se ofrece una versión regional del teorema de Coase donde se destaca la importancia de las instituciones. La diversidad institucional en el tiempo y en el espacio implica la invalidez de las conclusiones universales de la economía neoclásica precoaseana, y apunta la relevancia de los fundamentos teóricos del nuevo institucionalismo para la geografía humana y los estudios regionales. Concebir a las instituciones como las reglas del juego de una sociedad implica una aproximación teórica al comportamiento humano que incluye el papel de los modelos mentales subjetivos y de las estructuras de creencias de los individuos.

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Understanding the complex process of climate change implies the knowledge of all possible determinants of CO 2 emissions. This paper studies the influence of several institutional determinants on CO 2 emissions, clarifying which variables are relevant to explain this influence. For this aim, Genetic Programming and Artificial Neural Networks are used to find an optimal functional relationship between the CO 2 emissions and a set of historical, economic, geographical, religious, and social variables, which are considered as a good approximation to the institutional quality of a country. Besides this, the paper compares the results using these computational methods with that employing a more traditional parametric perspective: ordinary least squares regression (OLS). Following the empirical results of the cross-country application, this paper generates new evidence on the binomial institutions and CO 2 emissions. Specifically, all methods conclude a significant influence of ethnolinguistic fractionalization (ETHF) on CO 2 emissions.