A new general-equilibrium model that links together rural-to-urban migration, the externality effect of the average level of human capital, and agglomeration economies shows that in developing countries, unrestricted rural-to-urban migration reduces the average income of both rural and urban...

Planet Earth, with its plethora of natural (im)balances, has a venerable age of 4.54 billion years; the (industrial) imprint placed by the human species on it, considered to be not negligible, counts of just little over two centuries; while the digital/IT&C/virtual existence of man, in what we...