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Sökning: WFRF:(Greenaway C)

  • Resultat 1-15 av 15
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  • Kanai, M, et al. (författare)
  • 2023
  • swepub:Mat__t
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  • Pertl, Leonhard, et al. (författare)
  • Exports and Productivity : Comparable Evidence for 14 Countries
  • 2007
  • Ingår i: Policy Research Working Papers. - New York : World Bank. - 1813-9450.
  • Rapport (refereegranskat)abstract
    • The authors use comparable micro level panel data for 14 countries and a set of identically specified empirical models to investigate the relationship between exports and productivity. The overall results are in line with the big picture that is by now familiar from the literature: Exporters are more productive than non-exporters when observed and unobserved heterogeneity are controlled for, and these exporter productivity premia tend to increase with the share of exports in total sales; there is strong evidence in favour of self-selection of more productive firms into export markets, but nearly no evidence in favour of the learning-by-exporting hypothesis. The authors document that the exporter premia differ considerably across countries in identically specified empirical models. In a meta-analysis of their results the authors find that countries that are more open and have more effective government report higher productivity premia. However, the level of development per se does not appear to be an explanation for the observed cross-country differences.
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15.
  • Stensmyr, M C, et al. (författare)
  • Insect-like olfactory adaptations in the terrestrial giant robber crab
  • 2005
  • Ingår i: Current Biology. - : Elsevier BV. - 1879-0445 .- 0960-9822. ; 15:2, s. 116-121
  • Tidskriftsartikel (refereegranskat)abstract
    • The robber crab (Birgus latro), also known as the coconut crab, is the world's largest land-living arthropod, with a weight reaching 4 kg and a length of over half a meter [1]. Apart from the marine larval stage [2, 3], this crab is fully terrestrial, and will actually drown if submerged in water [4]. A transition from sea to land raises dramatically new demands on the sensory equipment of an animal. In olfaction, the stimulus changes from hydrophilic molecules in aqueous solution to mainly hydrophobic in the gaseous phase [5]. The olfactory system of land crabs thus represents an excellent opportunity for investigating the effects of the transition from sea to land. Have land crabs come to the same solutions as other terrestrial animals, or is their olfactory sense characterized by unique innovations? Here, we show that the robber crab has evolved an olfactory sense with a high degree of resemblance to the insect system. The similarities extend to physiological, behavioral, and morphological characters. The insect nose of the robber crab is a striking example of convergent evolution and nicely illustrates how similar selection pressures result in similar adaptation.
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  • Resultat 1-15 av 15

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