A Model of Fickle Capital Flows and Retrenchment: Global Liquidity Creation and Reach for Safety and Yield

摘要

Gross capital flows are very large and highly cyclical. They are a central aspect of global liquidity creation and destruction. They also exhibit rich internal dynamics that shape fluctuations in domestic liquidity, such as the fickleness of foreign capital inflows and the retrenchment of domestic capital outflows during crises. In this paper we provide a model that builds on these observations to address some of the main questions and concerns in the capital flows literature. Within this model, we find that for symmetric economies, the liquidity provision aspect of capital flows vastly outweighs their fickleness cost, so that taxing capital flows, while could prove useful for a country in isolation, backfires as a global equilibrium outcome. However, if the system is heterogeneous and includes economies with abundant (DM) and with limited (EM) natural domestic liquidity, there can be scenarios when global liquidity uncertainty is high and EM's reach for safety can destabilize DMs, as well as risk-on scenarios in which DM's reach for yield can destabilize EMs.