S9 Ep30: Redefining the monetary standard

The fiat money system has survived the Great Inflation, the global financial crisis, and a pandemic. But can it survive digital currencies?Bitcoin and the blockchain solved a genuine problem in computer science: how to stop people spending the same money twice. Forty years of successful inflation control means central bank money is stable; that is the stability in stablecoins, attempting to solve the volatility problem. What's next? What if the unit of account itself were indexed to consumer prices? Digitalisation might finally make that approach viable at scale. Price stability, by design.Will we still need cash? Maybe not now, But if you never use it, it may not be there if the blackout comes.The research behind this episode:Stracca, Livio. 2025. Redefining the Monetary Standard in the Digital Age: Digital Innovations and the Future of Monetary Policy. Springer Nature.To cite this episode:Phillips, Tim, and Livio Stracca. 2026. "Redefining the monetary standard." VoxTalks Economics (podcast). Assign this as extra listening. The citation above is formatted and ready for a reading list or VLE.About the guestLivio Stracca is Deputy Director General for International and European Relations at the European Central Bank, where he has worked for more than two decades. His research spans monetary economics, international finance, and the implications of digitalisation for central banking, with extensive work on exchange rates, capital flows, and the architecture of the international monetary system. Research cited in this episodeThe double-spend problem. The fundamental challenge in any decentralised digital payment system: how to prevent a participant from spending the same unit of money twice when there is no trusted central authority to verify transactions. Bitcoin's 2008 white paper offered an innovative solution by making the transaction ledger public, cumulative, and computationally expensive to rewrite. The trade-off is that transparency sacrifices privacy; every transaction is visible to all participants in the network.The blockchain. A distributed ledger in which transactions are grouped into sequential blocks, each cryptographically linked to the one before. Reversing any transaction requires rewriting every subsequent block, which demands enormous computational effort. This design solves the double-spend problem in a decentralised network but makes the system slow and costly to operate at scale.The payment trilemma. A framework discussed in the episode and in Stracca's book: any digital payment system can optimise for at most two of three properties simultaneously (universal access, security against fraudulent transactions, and privacy). Cash is the only instrument that escapes the trilemma; digital systems must accept a trade-off among the three, and the choice is often made implicitly by the designer of the system rather than through democratic deliberation.Hayek, Friedrich A. 1976. Denationalisation of Money. London: Institute of Economic Affairs. The classic argument for currency competition: let currencies compete freely and the one providing the most stable prices will win. Economists, including Milton Friedman, largely rejected the proposal on the grounds that money exhibits strong network externalities; the more people use a currency, the more attractive it becomes to the next user, producing a natural tendency towards monopoly. A formal modern revisitation, finding similar conclusions, is Fernández-Villaverde, Jesús, and Daniel Sanches. 2019. "Can Currency Competition Work?" Journal of Political Economy 127 (3): 1017 to 1058.Irving Fisher's compensated dollar. A proposal published in Fisher, Irving. 1913. "A Compensated Dollar." Quarterly Journal of Economics 27 (2): 213–235 (the same year the Federal Reserve was created). Fisher argued for a dollar whose purchasing power was held constant by adjusting its gold content in line with prices. The mechanical details of his proposal are no longer relevant, but its animating idea (indexing the unit of account to a price level) has gained new plausibility in a digital context.The Unidad de Fomento. Chile's inflation-indexed unit of account, in operation since 1967 and updated daily against the consumer price index. It is used widely in long-term contracts, including mortgages, and functions as a security that can be traded. Stracca cites it as evidence that an indexed monetary standard is operationally feasible, and as a prototype for what a digital equivalent might look like at larger scale.The Great M