This book examines the migration of highly skilled labour from developing countries to developed ones and assesses the economics costs associated with this. By highlighting the impact of migration on developing countries, it outlines the development challenges created by the loss of highly skilled workers, especially the loss of specialised knowledge. With a particular focus on the movement of labour from Türkiye to the rest of the world, the inability of Türkiye to grow its own IT and engineering industries is discussed, alongside attempts to retain highly skilled labour. This book offers a new perspective on global migration and the hidden economic costs associated with it. It will be relevant to students, researchers, and policymakers interested in labour and development economics.