Throughout history, border walls and fences have been built for defense, to claim land, to signal power, and to control migration. The costs of fortifications are large while the benefits are questionable. The recent trend of building walls and fences signals a paradox: In spite of the...

Throughout history, border walls and fences have been built for defense, to claim land, to signal power, and to control migration. The costs of fortifications are large while the benefits are questionable. The recent trend of building walls and fences signals a paradox: In spite of the...

This contribution investigates the opportunities of migration for developing countries. The benefits of migration for sending countries are often undervalued. But migrants may foster trade, remittances, innovations, investments back home, and even return home at some time with better human...