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	Provedor de dados Naturalis (1) AgEcon (1) Autor Burger, Kees (1) Winter, A.J. de (1) Palavra-chave Côte d'Ivoire (2) 42.73 (1) Africa (1) Cameroon (1) Cocoa (1) Crop Production/Industries (1) Gabon (1) Gastropoda (1) Helicarionoidea (1) International Relations/Trade (1) Land snails (1) Optimal export tax (1) Primary commodities (1) Pseudosaphtia (1) Public Economics (1) Saphtia (1) Taxonomy (1) Thapsia (1) Urocyclidae (1) Vanmolia (1) Mais... Tipo do documento Article / Letter to the editor (1) Conference Paper or Presentation (1) Ano 2008 (2) País Netherlands (1) United States (1) Idioma Inglês (1)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Redefinition of Thapsia Albers, 1860, and description of three more helicarionoid genera from western Africa (Gastropoda, Stylommatophora) Naturalis Winter, A.J. de. As presently used, the helicarionoid genus Thapsia Albers, 1860 embraces a large, heterogeneous assemblage of species. As a first step in the revision of this group of taxa, the genus Thapsia (type species Helix troglodytes Morelet, 1848) is redefined anatomically and conchologically. In the absence of alcohol-preserved material of T. troglodytes, Thapsia ebimimbangana spec. nov. from Cameroon and T. wieringai spec. nov. from Gabon are described to characterize the soft parts morphology of Thapsia. Three new genera are introduced, viz. Saphtia gen. nov. (type species S. granulosa spec. nov.), Pseudosaphtia gen. nov. (type species P. brunnea spec. nov.) and Vanmolia gen. nov. (type species Thapsia sjoestedti d’Ailly, 1896). A second species of Saphtia, S.... Tipo: Article / Letter to the editor Palavras-chave: Cameroon; Côte d'Ivoire; Gabon; Africa; Gastropoda; Taxonomy; Land snails; Helicarionoidea; Thapsia; Saphtia; Pseudosaphtia; Vanmolia; Urocyclidae; 42.73. Ano: 2008 URL: http://www.repository.naturalis.nl/record/273964 Optimal export taxes – the case of cocoa in Cote d'Ivoire AgEcon Burger, Kees. Export taxes can provide additional welfare to large exporters, an argument for interventions in many primary commodity exporting countries. We investigate the benefits of export taxation for Côte d'Ivoire, the dominant exporter of cocoa. Where many applications treat the formula for optimal export taxes incorrectly as a prescription, we take the endogeneity of the exporter’s share into account. We also distinguish between short-term and long-term effects, relevant for a tree crop like cocoa and we allow for a normal commercial margin between export and farm gate prices. Results are calculated via simulations in a model, in which the age-compositions of the tree stocks of major producing countries are distinguished. Simulations over a period of 15 years... Tipo: Conference Paper or Presentation Palavras-chave: Optimal export tax; Primary commodities; Cocoa; Côte d'Ivoire; Vintage model; Crop Production/Industries; International Relations/Trade; Public Economics. Ano: 2008 URL: http://purl.umn.edu/6395 Registros recuperados: 2 Primeira ... 1 ... Última

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