Originally published in 1974, this volume deals with studies of migration from census and other data, variations in scale, distance and duration of various types of migration, social relations of migrant populations with their home areas and their host communities, and expectations and valuation of migrants concerning rural and urban life. It also examines interrelations between levels of migration, labour supply, wage rates and unemployment in urban centres, the impact of different types of migration on the national economy and economic planning and governemnt measures and conflicting interests of the labour supplying and receiving countries. The introduction analyses the main economic and political factors and the socio-economic consequences and problems brought about by migrations in and between territories.