International capital flows are fickle. Short-term debt funding is especially subject to sudden stops. Sudden flight into safe-haven currencies can cause large disruptions and sharp currency movements ultimately leading to a crisis. When markets shift from a risk-on to a risk-off mood cross-country capital flows are triggered if the safe asset is not supplied symmetrically across counties. Advanced economies which supply safe assets experience capital inflows while most emerging economies suffer sudden outflows. Hence the design of global safe assets is paramount in creating a stable global financial architecture.