US Dollar as a Global Reserve Currency

A global reserve currency is a currency widely held by central banks and monetary authorities as part of their foreign exchange reserves. The US dollar remains the principal reserve currency because it combines economic credibility, abundant safe assets and powerful network effects in trade and finance.

Economic and institutional foundations

Confidence in the dollar rests on the scale and diversity of the US economy, its capacity to meet obligations and the credibility of its monetary and legal institutions.

• The United States has deep, open and highly liquid financial markets, allowing large transactions with relatively low cost.
• The large stock of US Treasury securities provides reserve managers with readily tradable assets that are widely treated as safe and usable as collateral.
• Currency convertibility, protection of contracts and comparatively predictable institutions support confidence in dollar-denominated assets.

Self-reinforcing international use

The dollar's established use makes further dollar use convenient. These network effects create high switching costs for governments, firms and financial institutions.

• A large share of international trade, commodity pricing and cross-border financial contracts is denominated or settled in dollars.
• Dollar-based banking, payment and funding markets provide liquidity across countries, including through offshore dollar markets.
• Widespread acceptance reduces transaction and hedging costs because market participants expect their counterparties to use the same currency.

Historical advantage and limited substitutes

The 1944 Bretton Woods system placed the dollar at the centre of the post-war monetary order. Although dollar-gold convertibility ended in 1971, accumulated reserves, contracts, institutions and market practices preserved its incumbent advantage.

• A competing currency must simultaneously offer economic scale, convertibility, institutional trust and a large supply of liquid safe assets.
• Potential alternatives do not yet match the dollar across all these attributes, so diversification has not displaced its central role.
• The ability of the United States to supply dollar assets to the world reinforces the system, although it also creates dependence on US monetary and financial conditions.