Complementarity (molecular biology)

Biology

Reserve currency

Devaluation

Unit of account

Virtual currency

Economics

Computer science

Business

Genetics

Foreign-exchange reserves

Monetary economics

Value (mathematics)

Foreign exchange risk

International economics

Machine learning

Currency

The Quarterly Journal of Economics

We explore the interplay between trade-invoicing patterns and the pricing of safe assets in different currencies. Our theory highlights the following points: (i) a currency’s role as a unit of account for invoicing decisions is complementary to its role as a safe store of value; (ii) this complementarity can lead to the emergence of a single dominant currency in trade invoicing and global banking, even when multiple large candidate countries share similar economic fundamentals; (iii) firms in emerging-market countries endogenously take on currency mismatches by borrowing in the dominant currency; and (iv) the expected return on dominant-currency safe assets is lower than that on similarly safe assets denominated in other currencies, thereby bestowing an “exorbitant privilege” on the dominant currency. The theory thus provides a unified explanation for why a dominant currency is so heavily used in both trade invoicing and in global finance.

Banking, Trade, and the Making of a Dominant Currency