How Paypal robs the Bank of England

Digital currencies might start creating a sticky situation for central banks.

Have you ever wondered how the rise of digital currencies will impact on the monetary base, and the effects that will have on seigniorage revenue to governments worldwide? No? Well, this pair of articles by the Financial Times' Izabella Kaminska, "Why central banks should take charge of their digital currencies" and "Turning mobile money into M0" is interesting nonetheless.

Kaminska examines the typical problem central banks have with digital currencies, which is that they tend to mess around with the way banks expect the money supply of the nation to work. The immediate downside of that is that it impacts on seigniorage, the revenue accrued to a government by its right to mint coinage.

In other words, when you use PayPal rather than posting a £50 note, you need never hold that currency, and the government never receives the revenue for having printed it.

She writes:

Consequently, what you end up with is something very different to cash of the realm. In many ways, it’s worse than zero-yielding money due to the natural decay associated with transactional, creation and redemption costs. The other point is that Safaricom [the vendor of a hugely popular Kenyan mobile currency] is actually behaving much like a quasi-autonomous state within a state that’s issuing its own private money system, the value of which is constantly pegged to the official currency of the land.

How can nations fight back? (Assuming, of course, they ought to fight back — but that revenue is likely to be mighty tempting.) One possibility is by working with digital currency vendors to create payment mechanisms which don't require holding a parallel currency to work. And make no mistake, even though PayPal denominates its accounts in pounds and dollars, it's a parallel currency in all but name.

Jean-François Groff, one of the pioneers of the Web at CERN, is working on that option. Mobino, his company, is a mobile payment system which works on real-time debiting, not on keeping a float of a second currency on tap:

Mobino’s system aims to cut out as many intermediaries from the debit process as possible by getting you, the customer, to strike up a single direct debit agreement with itself. The company then charges the customer for transactions conducted with partner vendors, whilst the customer deals only with Mobino rather than a multitude of online or retail vendors.

And if that scheme was done by Mobino — or a similar system — working with a central bank, then the costs of running it could be funded from the seigniorage revenue it returns to the government. Rather than the cost of "printing" money being the actual ink and paper, it would become the price of maintaining servers and bandwidth.

In an ideal state-controlled money world, you could imagine the system mutating into one where the central bank itself ended up billing you directly for the use of their digital cash. So, rather than withdrawing physical cash to conduct your payments, you’d be transacting state-issued digital cash, now credited or debited from your account as quickly as a bank credits or debits cash to you at the ATM wall.

But, while Kaminska mentions it in passing, it would be interesting to see the analysis applied to Bitcoin. Lord knows the currency has its flaws, but it's the only one of the successful(ish) mobile payment systems which actually embraces the fact that it is a parallel currency — and a freely floating one, at that. The Bitcoin ecosystem has a specific method for distributing the seigniorage it generates, but also gradually reduces that rate; by 2140, the system will likely be in de-facto deflation.

By moving the transaction entirely into a parallel currency, the system is also more efficient than even Mobino could ever hope to be — provided you don't plan on converting Bitcoins into real-world money. If you do, things get trickier; the exchanges have had a number of high-profile failures, and are probably the weakest point in a network which manages to combine cryptographic perfection with an incredible amount of possibilities for human error.

It may be the case that central banks have to start examining what their role would be in a world of digital currencies; but if they do, it may be better for them to skip the sticking-plaster world of PayPal and Mobino and move straight to something designed for an all-digital world from the start.

Photograph: Getty Images

Alex Hern is a technology reporter for the Guardian. He was formerly staff writer at the New Statesman. You should follow Alex on Twitter.

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PMQs review: Theresa May shows again that Brexit means hard Brexit

The Prime Minister's promise of "an end to free movement" is incompatible with single market membership. 

Theresa May, it is commonly said, has told us nothing about Brexit. At today's PMQs, Jeremy Corbyn ran with this line, demanding that May offer "some clarity". In response, as she has before, May stated what has become her defining aim: "an end to free movement". This vow makes a "hard Brexit" (or "chaotic Brexit" as Corbyn called it) all but inevitable. The EU regards the "four freedoms" (goods, capital, services and people) as indivisible and will not grant the UK an exemption. The risk of empowering eurosceptics elsewhere is too great. Only at the cost of leaving the single market will the UK regain control of immigration.

May sought to open up a dividing line by declaring that "the Labour Party wants to continue with free movement" (it has refused to rule out its continuation). "I want to deliver on the will of the British people, he is trying to frustrate the British people," she said. The problem is determining what the people's will is. Though polls show voters want control of free movement, they also show they want to maintain single market membership. It is not only Boris Johnson who is pro-having cake and pro-eating it. 

Corbyn later revealed that he had been "consulting the great philosophers" as to the meaning of Brexit (a possible explanation for the non-mention of Heathrow, Zac Goldsmith's resignation and May's Goldman Sachs speech). "All I can come up with is Baldrick, who says our cunning plan is to have no plan," he quipped. Without missing a beat, May replied: "I'm interested that [he] chose Baldrick, of course the actor playing Baldrick was a member of the Labour Party, as I recall." (Tony Robinson, a Corbyn critic ("crap leader"), later tweeted that he still is one). "We're going to deliver the best possible deal in goods and services and we're going to deliver an end to free movement," May continued. The problem for her is that the latter aim means that the "best possible deal" may be a long way from the best. 

George Eaton is political editor of the New Statesman.