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One of the world's most notorious cases of counterfeiting was the 1925 Portuguese banknote crisis, when Artur Virgilio Alves Reis managed to pass off 200,000 fake five-hundred escudo notes, worth around £56 million in 2016 terms. When the Bank of Portugal discovered the counterfeits in December 1925, it announced an aggressive demonetization of the five-hundred escudo note, giving citizens just twenty days to bring in old notes for redemption. By then, the damage had been done. Reis had managed to increase Portugal's supply of banknotes by 5.9%, spending the equivalent of 0.88% of Portugal's nominal GDP into circulation! (More here .) An aggressive note demonetization in the face of large-scale counterfeiting is a thoroughly justified response as it immediately puts a halt to the problem. In this context, it's worth revisiting the world's most recent attempt to combat counterfeiting with an aggressive demonetization — India PM Narendra Modi's forced recall of th

The recent bitcoin chain split got me thinking again about bitcoin-as-money, specifically as a unit of account . If bitcoin were to serve as a major pricing unit for commerce on the internet, we'd have to get used to some very strange macroeconomic effects every time a chain split occurred. In this post I investigate what this would look like. While true believers claim that bitcoin's destiny is to replace the U.S. dollar, bitcoin has a long way to go. For one, it hasn't yet become a generally-accepted medium of exchange. People who own it are too afraid to spend it lest they miss out on the next boom in its price, and would-be recipients are too shy to accept it given its incredible volatility. So usage of bitcoin has been confined to a very narrow range of transactions. But let's say that down the road bitcoin does become a generally-accepted medium of exchange. The next stage to becoming a full fledged currency like the U.S. dollar involves becoming a unit of account

The new 12-sided pound coin released earlier this year The UK's recently-introduced one pound coin is made of 8.75 grams of metal, 76% of that copper and the remaining 24% a combination of zinc and nickel. At market prices, this amount of metal is worth around four pennies. So why do pounds trade for 100 pennies? Why are Brits passing these coins around as tokens—i.e. far above their metal content—rather than at their intrinsic melt value of four pennies each? One answer is tradition. Brits accept that pound coins should trade at a 2000% premium to their metallic content because they've always done so. This isn't a very satisfactory answer. We need an explanation for why this tradition emerged in the first place. It could be that the British government simply says that coins must be worth more than their metallic content, and Brits have fallen in line with this order. If they pass on these tokens at an illegal price, they'll be fined, or thrown in prison, or forced to