Sökning: "trade costs"

Visar resultat 16 - 20 av 236 avhandlingar innehållade orden trade costs.

  1. 16. Age, Longevity and Life-History Trade-Offs in the Collared Flycatcher (Ficedula albicollis)

    Författare :Joanna Sendecka; Lars Gustafsson; Anna Qvarnström; Pat Monaghan; Uppsala universitet; []
    Nyckelord :Ecology; age; collared flycatcher; Ficedula albicollis; long-term study; senescence; longevity; reproductive success; selection; individual quality; breeding experience; reproductive effort optimization; terminal investment; life-history trade-offs; reproductive costs; Ekologi;

    Sammanfattning : Age is often a neglected factor in ecological studies. However, age-related changes in reproduction and survival of organisms may strongly influence population dynamics. LÄS MER

  3. 17. Age-specific trade-offs in life-history evolution

    Författare :Martyna K. Zwoinska; Alexei Maklakov; Marjo Saastamoinen; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; life history; trade-off; learning; aging; sex differences; dispersal; Caenorhabditis; Drosophila; Biologi med inriktning mot zooekologi; Biology with specialization in Animal Ecology;

    Sammanfattning : Trade-offs prevent selection from driving all fitness-enhancing traits towards values that would maximize fitness. Life-history trade-offs, such as the one between survival and reproduction are well-studied, yet trade-offs can also involve behavioural or cognitive traits. LÄS MER

  4. 18. Physiological trade-offs in reproduction and condition dependence of a secondary sexual trait

    Författare :Måns S. Andersson; Victor Apanius; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Developmental biology; Trade-offs; life history; immune ecology; cost of reproduction; costs of immune response; sexual selection; migration; moult; Newcastle disease; HbA1C; Ficedula albicollis; Utvecklingsbiologi; Developmental biology; Utvecklingsbiologi; Animal Ecology; zooekologi;

    Sammanfattning : This thesis examines parental condition, how it is traded off against reproduction and how it is displayed in a secondary sexual trait. The studies were performed on nest-box breeding collared flycatchers Ficedula albicollis on the island of Gotland, in the Baltic Sea. LÄS MER

  5. 19. Essays on International Trade, Productivity and Firm Heterogeneity

    Författare :Anders Åkerman; Rikard Forslid; Diego Puga; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Agglomeration; productivity; firm heterogeneity; export processing zones; firm dynamics; market size; beachhead costs; natural experiment; Economics; Nationalekonomi; Economics; nationalekonomi;

    Sammanfattning : The thesis consists of three papers, summarized as follows.”Trade, Intra-Industry Reallocations and Aggregate Productivity: A Bridge between Theory and Data in Öresund”The paper aims at estimating the causal effect of trade liberalisation on aggregate productivity through firm selection as in Melitz (2003). LÄS MER

  7. 20. Essays on Trade, Technology and the Organization of Firms

    Författare :Shon Ferguson; Rikard Forslid; Philippe Martin; Stockholms universitet; []
    Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; International Trade; Endogenous Technology; Research and Development; Quality Competition; Market Size; Comparative Advantage; Contract Enforcement; Vertical Integration; Economics; Nationalekonomi; Economics; nationalekonomi;

    Sammanfattning : "Endogenous Sunk Costs, Exporting and Heterogeneous Firms" Empirical evidence shows that R&D spending is highly correlated with firm productivity and highly concentrated among large firms. This paper develops a model of quality competition with heterogeneous firms that can explain these patterns. The model makes two new predictions. LÄS MER