Home sweet host: Prudential and monetary policy spillovers through global banks

Prudential regulation of banks is multi-layered: policy changes by home-country authorities affect banks' global operations across many jurisdictions; changes by host-country authorities shape banks' operations in the host jurisdiction regardless of the nationality of the parent bank. Which layer matters most? Do these policies create cross-border spillovers? And how does monetary policy alter these spillovers? This paper examines the effect that changes in home- and hostcountry prudential measures have on cross-border credit, and how these interact with monetary policy. We use a novel approach to decompose growth in cross-border bank lending into separate home, host and common components, and then match each with the home or host policies that affect this component. Our results suggest that prudential policies can have spillover effects, which depend on the instrument used and on whether a bank's home or host country implemented them. Home policies tend to have larger spillovers on cross-border US dollar lending than host policies, primarily through substitution effects. We also find that a tightening of US monetary policy can compound the spillovers of certain prudential measures.