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' for four distinctly different African countries (Morocco, Egypt, Senegal and Ghana). In general, great expectations about … potential migrants are only present in Ghana and Egypt. The differences in intentions by age and sex are also quite noteworthy … Ghana and Egypt. The network effects of potential migrants turn out to be less important than one might expect from actual …
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In this paper we test the celebrated `Strength of weak ties' theory of Granovetter (1973). We test two hypotheses on the network structure in a data set of collaborating economists. While we find support for the hypothesis of transitivity of strong ties, we reject the hypothesis that weak ties...
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