The Curse of Cash: An interview with Kenneth Rogoff (Part II)


This is the second installment of a two-part interview with economist Kenneth Rogoff on his new book, The Curse of Cash. Read the first part here.

Your new book advocates a “less cash” society, phasing out all paper currency notes over (roughly) $10, and in due time even replacing those notes with large coins.(You observe that notes of $10 or less account for only 3% of the US currency supply). How will getting rid of the vast majority of all paper currency help central banks fight financial crises?

KR: It will allow central banks to engage in much more aggressive stimulus with unfettered and open-ended negative interest rate policies, without running up against the “zero lower bound” on interest rates, a bound that exists because cash pays a zero return that any bond has to match. There are other ways to stimulate the economy at the zero bound, some quite elegant, but phasing out cash is simplest and more robust solution. If only large bills are phased out, people could in principle hoard smaller ones, but the cost is far greater (allowing rates to be much more negative), and in extreme circumstances, the government can place other restrictions on redepositing cash into the banking system.

How do negative interest rates work?

KR: The idea behind negative interest rates is simple: they give money that has been hibernating in the banking system a kick in the pants to get it out into the economy to stimulate demand thereby pushing up inflation and output. If successful, negative interest policy could end up being very short-lived because as demand and inflation rise, so too will market interest rates. In other words, if there were no obstacles, central banks could use negative interest rate policy to push down very short term interest rates, but at the same time longer term interest rates would actually rise because people would start to again expect normal levels of inflation and inflation risk. If you are worried about your pension then, on balance, this would be a very good trade.

Are negative rates the main reason to phase out cash?

KR: There are other very clever ways to introduce negative rates without phasing out cash, and the book explains these at length, with one especially clever idea in having its roots in the practices of the Mongol empire of Marco Polo’s time. In any event, the case for drastically scaling back paper currency is very strong even if the central bank is proscribed from setting negative rates. That would be mistake, as negative rates are a valuable tool. In any event, because phasing out cash opens the door wide to negative rates, it makes sense to treat the two topics in any integrative fashion as we do in this book.

Haven’t the early returns on negative interest rates been mixed?

KR: Some central banks have tiptoed into negative interest policy already, but they can only move so far before investors start to hoard cash, hampering the effectiveness of negative interest rates. If negative interest rates were open-ended, central banks could decisively shift expectations without necessarily having to go to extreme lengths.

Aren’t negative rates bad for financial stability?

KR: Not necessarily, because open-ended negative rate policy would allow central banks to turbocharge out of deflation, so that the low interest rate period would be relatively short-lived. The existing regime, where rates have been stuck at zero for many years at a time, likely presents far more risk to financial stability.

Is expanding the scope for negative interest rates really worth the trouble if the next big financial crisis isn’t expected to occur for many decades?

KR: Well, first of all, the next major financial crisis might come a lot sooner than that. Besides, the option of negative interest rates might matter even for the next “normal” recession if the general level of world interest rates remains as low as it has been in recent years. Clearing the way for open ended negative interest rate policy would not only help make monetary policy more effective, it would clear that air of a lot of dubious policy suggestions that would be extremely damaging in the long run. Too often, the zero bound is used as an excuse to advance politically motivated policies that might or not be a good idea, but should be evaluated on their own merits.

Kenneth S. Rogoff is the Thomas D. Cabot Professor of Public Policy at Harvard University and former chief economist of the International Monetary Fund. He is the coauthor of the New York Times bestseller This Time Is Different: Eight Centuries of Financial Folly (Princeton).  He appears frequently in the national media and writes a monthly newspaper column that is syndicated in more than fifty countries. Rogoff resides in Cambridge, Massachusetts.


  1. […] Rogoff, a Harvard University professor of public policy, is calling for a “less-cash” society.  […]