This paper is concerned with the determinants and consequences of immigrant/linguistic concentrations (enclaves). The reasons for the formation of these concentrations are discussed. Hypotheses are developed regarding ?ethnic goods? and the effect of concentrations on the immigrant?s language...

Should the national government undertake policies aimed at strengthening the economies of particular localities or regions? Agglomeration economies and human capital spillovers suggest that such policies could enhance welfare. However, the mere existence of agglomeration externalities does not...