Note that the BRICS are known for loosing their richest (and most talented) citizens. ("Brain drain").
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The demographic composition of intra-EU migrants by nationality has remained broadly unchanged: Romanians make up the largest group, accounting for 27 per cent of intra-EU migrants, followed by Poles (12 per cent) and Italians (10 per cent). The main “contributors” to this exodus are the economic powerhouses – Germany and Luxembourg in the EU, but also Switzerland