David Friedman on the price of money

I always considered David Friedman to be very special. I have read all his books and I seldom find myself disagreeing with him (we even have a odd interest in Iceland in common). However, I have a slightly controversial interpretation of David Friedman’s thinking – I think his views really is a reflection of what Milton Friedman really would have liked to say if he had been truly free to express his views. Milton Friedman was the one who with his writings both turned me into a monetarist and a libertarian, but David Friedman’s views in many ways are probably closer to what I think about most things. David Friedman as his father of course also is a fantastic writer and thinker.

David’s thinking in my view is the best illustration of what I in my book on his father called the pragmatic revolutionary. His views might on the surface not be all that radical, but once you understand the logic of his thinking you yourself become a radical. David is the best example of this and I hope I am as well.

David, however, has been carefully not writing or speaking too much about monetary issues – his dad’s speciality. However, his latest post on his blog is exactly about that.

David comments on a very import topic – the general misunderstanding that interest rates is the price of money. This is a key monetarist insight that Market Monetarists often also would put forward. Unfortunately David’s comments in Tim Congdon’s new book “Money in a Free Society”. David seems to think that Tim does not understand that money is the price of money. Contrary to this I think that Tim is very much aware that it is a fallacy to say to low interest rates is the same as easy money. I think the misunderstanding is due to Tim’s discussion of the institutional difference between UK and US monetary policies in the 1980s, but I don’t want to be the judge on that. Therefore, I will just concentrate on David’s argument, while I don’t think Tim should be held accountable for a fallacy that he obviously don’t believe in.

Here is David:

It is said that “interest rate” is “the price of money.”

“This is a very common error, and one that is not only wrong but dangerously wrong…If the price of an apple is fifty cents, that means that if I give a seller fifty cents he will give me an apple in exchange. If the interest rate is five percent and that is the price of money, I ought to be able to buy money for five cents on the dollar. I doubt … anyone else, will be willing to sell it to me at that price…The price of money is what you have to give up to get it—the inverse of the price level. If the price of an apple is fifty cents, the price of a dollar is two apples. The interest rate is the rent on money, measured in money. A change in the price of money affects both the money you are renting and the money you are paying as rent, leaving the ratio of the two unchanged…Suppose that at midnight tonight every dollar bill in the world twins, along with a similar change in the accounting entries for bank deposits, other forms of money, and all obligations denominated in money. By morning, there is twice as much money as before—and nothing else has changed…I would ask Congdon (it should be Mr. X!) whether, under those circumstances, he would expect the interest rate to drop. If his answer is yes, my next question is whether he would expect a much more extreme drop if we relabeled pennies as dollars and dollars as hundred dollar bills, thus increasing the money supply, measured in “dollars,” a hundredfold…The reason the description of the interest rate as the price of money is not only wrong but dangerously wrong is that it implies a simple relation between money and the interest rate—in the extreme (but not uncommon) version, the belief that interest rates are set by central banks, with high interest rates the result of a tight monetary policy…A central bank can create money and lend it out, increasing the supply of loans (which reduces the interest rate) and increasing the money supply. That is the one element of truth to the relationship. But what is affecting the interest rate is not the amount of money but the amount of loans; the government could get the same effect by collecting more in taxes than it spends and lending out the difference…The interest rate is a market price—the price paid for the use of capital—and the central bank controls it only in the same sense in which the government can control the price of wheat by choosing to buy or sell some of it. The central bank does not have an unlimited amount of capital from money creation to lend and so has only a limited ability to shift interest rates from what they would otherwise be. Furthermore, a continued expansion of the money supply creates the expectation of future price rises, which pushes the nominal interest rate up, not down.”

I wish more people would understand this, but most of all I would hope that David would write much more about monetary theory.

For those interested I have a discussion of the price for money and interest rates in my paper on Market Monetarism.


Update: I was a bit too fast – I did not read David’s none-economic books like Harald and Salamander.

Leave a comment


  1. Alex Salter

     /  November 28, 2011

    Dr. Friedman makes an important and spot-on point. We at GMU are fortunate to have him here, if only for a little while longer.

  2. Alex, you guys art GMU are indeed very lucky!

  3. I expect you also haven’t read the two books I wrote with my wife about our interests in historical recreation—cooking from medieval cookbooks and the like. Through the magic of modern POD self-publishing they are now up on Amazon.

    More relevant, you can find the current draft of the book I’m working on, on Legal Systems Very Different From Ours, on my web page. Comments welcome:



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