Harvard's Mossavar Rahmani Center for Business and Government, which I am privileged to direct, has just issued an important paper by senior fellow Peter Sands and a group of student collaborators. The paper makes a compelling case for stopping the issuance of high denomination notes like the 500 euro note and $100 bill or even withdrawing them from circulation.

I remember that when the euro was being designed in the late 1990s, I argued with my European G7 colleagues that skirmishing over seigniorage by issuing a 500 euro note was highly irresponsible and mostly would be a boon to corruption and crime. Since the crime and corruption in significant part would happen outside European borders, I suggested that, to paraphrase John Connally, it was their currency, but would be everyone’s problem. And I made clear that in the context of an international agreement, the U.S. would consider policy regarding the $100 bill. But because the Germans were committed to having a high denomination note, the issue was never seriously debated in international forums.

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The fact that — as Sands points out — in certain circles the 500 euro note is known as the “Bin Laden” confirms the arguments against it. Sands’ extensive analysis is totally convincing on the linkage between high denomination notes and crime. He is surely right that illicit activities are facilitated when a million dollars weighs 2.2 pounds as with the 500 euro note rather than more than 50 pounds as would be the case if the $20 bill was the high denomination note. And he is equally correct in arguing that technology is obviating whatever need there may ever have been for high denomination notes in legal commerce.

What should happen next? I’d guess the idea of removing existing notes is a step too far. But a moratorium on printing new high denomination notes would make the world a better place. In terms of unilateral steps, the most important actor by far is the European Union. The €500 is almost six times as valuable as the $100. Some actors in Europe, notably the European Commission, have shown sympathy for the idea and European Central Bank chief Mario Draghi has shown interest as well. If Europe moved, pressure could likely be brought on others, notably Switzerland.

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These are difficult times in Europe with the refugee crisis, economic weakness, security issues and the rise of populist movements. There are real limits on what it can do to address global problems. But here is a step that will represent a global contribution with only the tiniest impact on legitimate commerce or on government budgets. It may not be a free lunch, but it is a very cheap lunch.