The Case for and Against Dollar Dominance
Whether the US dollar will remain the world's dominant reserve currency over the next 20–50 years is one of the most genuinely contested questions in international economics. Two serious analysts — Barry Eichengreen and Lyn Alden — represent the range of informed opinion, and their disagreement is instructive both for the arguments they make and for what they reveal about the limits of forecasting monetary systems.
The Case for Durability (Eichengreen)
Barry Eichengreen's Exorbitant Privilege (2011) argues that dollar dominance is more durable than its critics claim. His core arguments:
Network effects: Reserve currencies exhibit strong network effects — everyone accepts dollars because everyone else accepts dollars. Shifting a reserve currency is like shifting a language: individually rational actors cannot unilaterally switch, because the value comes from the network, not the individual.
No ready alternative: The euro exists but the eurozone lacks fiscal union, making euro-denominated safe assets scarce and governance uncertain. The renminbi faces capital controls. No alternative offers the depth, liquidity, and openness of US capital markets.
History of durability: Sterling remained a major reserve currency for 50 years after Britain's economic decline began. Reserve currency transitions are measured in generations, not years.
Institutional advantages: The US legal system, property rights protection, and financial regulation provide a rule-of-law environment that reserve managers value.
The Case for Decline (Alden)
Lyn Alden's Broken Money (2023) argues that structural forces are undermining dollar hegemony in ways that Eichengreen's network effects argument underweights:
The fiscal trajectory: US government debt has grown from 60% to over 120% of GDP since 2000, with no credible fiscal stabilisation plan. At some point, the debt trajectory raises questions about whether the Fed will be permitted to maintain the anti-inflationary discipline that reserve currency status requires.
Weaponisation: The use of dollar-denominated financial infrastructure as a geopolitical weapon (SWIFT exclusions, asset freezes) creates incentives for adversaries and fence-sitters to reduce dollar dependence. The 2022 reserve freeze is the clearest demonstration of this risk.
The global South's changing position: A large portion of the world's population lives in countries that do not benefit from dollar hegemony's terms of trade and have strong incentives to develop alternatives, particularly in bilateral trade.
Bitcoin as a potential alternative: Alden argues that Bitcoin — as a decentralised, censorship-resistant monetary asset — addresses specifically the trust problem that the 2022 freeze demonstrated. This argument is more speculative than her structural points.
The Honest Assessment
Both analysts are working with genuine uncertainty. Historical monetary transitions — from silver to gold, from sterling to dollar — took decades and could not have been predicted with precision from within the transition period. The dollar may remain dominant for another generation; it may face accelerating erosion. The honest position is that the direction of change is visible, the pace is uncertain, and the endpoint is unknown.