N°24-52: Segmented Dollar Funding

Deviations from covered interest rate parity (CIP) are often linked to limits to arbitrage, yet trading volumes surge during periods of apparent no-arbitrage violations. We show that these distortions stem from constraints on non-U.S. agents’ access to wholesale U.S. dollar markets and reflect a premium for unencumbered synthetic dollar funding: non-U.S. banks substitute secured USD borrowing with FX swaps to meet regulatory requirements. A shadow cost-augmented CIP condition holds, implying no riskless arbitrage. U.S. dealers extract rents on dollar provision while non-U.S. customers bear $10.4 billion in additional hedging costs. Our results illustrate how intermediary constraints segment global dollar funding.