This paper presents a model of consumer demand that is consistent with the observed expenditure patterns of individual consumers in a long time series of expenditure surveys and is also able to provide a detailed welfare analysis of shifts in relative prices. A nonparametric analysis of consumer expenditure patterns suggests that Engel curves require quadratic terms in the logarithm of expendit...

A new braconid wasp from the Upper Cretaceous (Cenomanian) amber of the Hukawng Valley in Kachin State, Myanmar is described and figured from a unique female. Seneciobracon novalatus Engel & Huang, gen. et sp. n., is placed in a distinct subfamily, Seneciobraconinae Engel & Huang, subfam. n., owing to the presence of a unique combination of primitive protorhyssaline-like traits, with an otherwi...

1School of Natural Sciences, Division of Psychology, University of Stirling, Stirling, FK9 4LA, Scotland 2CAPP: Centro de Administracao e Politicas Publicas and Instituto Superior de Ciencias Sociais e Políticas da Universidade Tecnica de Lisboa, Rua Almerindo Lessa, Polo Universitario do Alto da Ajuda, 1349-055 Lisboa, Portugal 3CRIA Centre for the Research in Anthropology and Departament of A...