How is a leading international currency replaced by another? Old versus new evidence

A. Mehl, M. Mlikota (University of Pennsylvania) and I. Van Robays in this ECB paper:

This special feature reviews the evidence – both old and new – on how a leading international currency is replaced by another. The conventional historical narrative is that inertia in international currency use is substantial – it takes a long time for a challenger currency to replace the incumbent owing to the existence of network externalities that give rise to lock-in effects. The US dollar remains the leading currency for global trade and finance today, despite the decline in the United States’ share of global output and trade, which testifies to the importance of inertia. However, one interesting exception is the currency invoicing of trade of countries neighbouring the euro area between 1999 – the year of the euro’s creation – and 2019, when the share of the euro increased by more than 20 percentage points on average, at the expense of the US dollar.

Two competing hypotheses may explain these developments: a trade shock – where stronger trade links with the euro area tilt invoicing towards the euro – and an exchange rate volatility shock – where growing use of the euro as an exchange rate anchor spills over to invoicing.

Recent evidence from ECB staff research empirically tests the relative importance of these two shocks.

The estimates give support to the view that a trade shock is a key determinant of the stronger role of the euro for invoicing international trade in countries neighbouring the euro area. In those countries where trade links with the euro area increased, the shock explains on average almost 40% of the rise in the share of exports invoiced in euro between 1999 and 2019.

By contrast, the impact of greater exchange rate stability against the euro is statistically insignificant. Countries’ invoicing currency choices are not just impacted by their own trade patterns and exchange rate volatilities but also by those of their trade partners and competitors. These effects operate mainly via bilateral trade linkages rather than strategic complementarities in export price setting, which underscores the relevance of changes to input-output linkages as determinants of invoicing currency patterns.

These findings have implications for policy. They suggest that, in response to the pandemic shock and the war in Ukraine, reshoring or friendshoring of production chains could lead to stronger regional trade, notably on the European continent. That in turn could strengthen the future role of the euro for the invoicing of international trade.