Currency Board

A currency board is a rule-based monetary arrangement under which a country's domestic currency is issued only against reserves of a designated foreign "anchor" currency, held at a legally fixed exchange rate and typically backed 100% (or more) by liquid foreign assets. Unlike a conventional central bank, an orthodox currency board does not engage in discretionary monetary policy: it cannot act as lender of last resort, cannot finance fiscal deficits, and cannot sterilise capital flows. The domestic money supply expands or contracts automatically with the balance of payments.

The model has deep colonial roots — the British colonial currency boards of the late 19th and 20th centuries (for example in West Africa, East Africa, and the Straits Settlements) are the classic templates. In the modern era, currency boards have been adopted as credibility devices to halt hyperinflation or stabilise post-conflict economies. Prominent cases include Hong Kong (pegged to the US dollar since 1983), Argentina under the Convertibility Plan (1991–2002), Estonia (1992–2010, anchored first to the Deutsche Mark then the euro), Lithuania (1994–2014), Bulgaria (since 1997, originally anchored to the DM), and Bosnia and Herzegovina (since 1997, under the Dayton framework).

Trade-offs are well documented:

• Benefits: imported monetary credibility, low inflation convergence with the anchor country, reduced exchange-rate risk for trade and investment.
• Costs: loss of independent monetary policy, no domestic lender of last resort, vulnerability to asymmetric shocks, and pro-cyclical adjustment that falls on wages and employment.

The Argentine collapse of 2001–02, when the one-peso-to-one-dollar peg was abandoned amid a banking run and sovereign default, is the canonical cautionary tale. Conversely, Hong Kong's Linked Exchange Rate System has withstood the 1997 Asian financial crisis and subsequent shocks, illustrating that currency boards can be durable when fiscal discipline and bank supervision are strong.