In international relations, short-run incentives for non-cooperation often dominate. Yet, (external) institutions for enforcing cooperation are hampered by national sovereignty, supposedly strengthening the role of selfenforcing mechanisms. This paper examines their scope with a focus on...

COVID-19 has drawn renewed attention to the economic importance of cross border mobility. Frictions in cross border mobility of labour can substantially impact the economy and international trade, by causing a long-term decrease in net migration that would alter the labour supply in many...