ABSTRACT The first part of this paper describes the small but constant expansion of the cross-state mobile population within the EU in the two decades preceding the 2004 enlargement. This expansion is puzzling in the light of the economic growth and the income convergence of member states over the same period. While the level of geographical mobility within the EU is frequently held to be ‘low’, data show that it should have been even lower given the rise of prosperity and the decline of income differentials in the EU15. In fact, it is argued that pro-mobility policies and the rise of non-labour migration have countered the diminishing appeal of intra-EU mobility that might be expected on the basis of purely economic conditions. The second part of the paper discusses the rationales and reasons of mobility. A distinction is drawn between observers’ and social actors’ views of the benefits of free movement. While the former usually put an emphasis on economic rewards, the latter are more likely to stress emotional and identity-linked returns. Survey data on Western European citizens who have resettled in another EU member state are revealing of the multifaceted causes and consequences of geographical mobility. In particular, these data show that identification with Europe and support for EU institutions in the mobile population are strikingly higher than among the general population. While it is true that cross-state mobility can entail economic benefits raising productivity and innovation, its political dividends are possibly even clearer.