Typography

Sticky prices illustrated, from Eichenbaum, Jaimovich, and Rebelo ( link ) What makes ride sharing firm Uber interesting is not just its use of new technology to mobilize unused car space, but the method it uses to price its services. Uber's surge pricing algorithm varies cab fares dynamically. To get from A to B, the car that you hired this morning for $10 could end up costing $100 this afternoon. How unlike the traditional taxi fare it is displacing! In their 2004 paper on sticky prices, economists Bils and Klenow found that taxi fares tended to remain at the same level for 19.7 months before being adjusted. Getting from A to B pretty much costs you the same price day-in-day-out for almost two years. In our internet age, are prices getting less sticky?  At first glance no. Alberto Cavallo , who along with Roberto Rigobon created the Billion Prices Index (the bane of all inflationistas ), has analyzed scraped data from the websites of retailers who continue to sell mostly thr...

Economists are sometimes guilty of misrepresenting real-world liquid objects as living examples of the abstract variables populating their favorite monetary model. A good example of this is the incorrect reliance on Yap stones to illustrate the idea of fiat money by economists as varying as Keynes, Milton Friedman and James Tobin. Whereas fiat money is intrinsically useless, inconvertible, and unbacked, Yap stones certainly aren't, the anthropological evidence revealing that the stones had cultural and religious significance apart from their monetary value. Similar in concept is the story of the macute , a unit of account used in Angola hundreds of years ago. Much like the exotic Yap stone, the existence of the macute (or macoute) came to the attention of Western thinkers as trade and conquest revealed ever large parts of the globe. Montesquieu was one of the first to describe the macute, noting: The negroes on the coast of Africa have a sign of value without money. It is a sign ...

Sir Thomas Gresham, c. 1554 by Anthonis Mor The zero-lower bound may seem like a new problem, but I'm going to argue that it's only the most recent incarnation of one of the most ancient conundrums facing monetary economists: Gresham's law. A number of radical plans to evade the zero-lower bound have emerged, including Miles Kimball's electronic money plan . When viewed with an eye to history, however, plans like Miles's are really not so radical. Rather, they are only the most recent in a long line of patches that have been devised by monetary tinkerers to spare the monetary system from Gresham-like monetary problems. Here's an old example of the problem. At the urging of Isaac Newton and John Locke, British authorities in 1696 embarked on an ambitious project to repair the nation's miserable silver coinage. This three-year effort consumed an incredible amount of time and energy. Something unexpected happened after the recoinage was complete. Almost immedi...

Florentine florin Last year Scott Sumner introduced the econ blogosphere to what he likes to call the medium-of-account function of money, or MOA, defined as the sign in which an economy's sticker prices and debts are expressed. Here and here are recent posts of his on the subject. I think Scott's posts on this subject have added a lot of depth to the interblog monetary debates. However, I've never been a big fan of Scott's terminology. As I've pointed out before , what Scott calls MOA, most modern economists would call the unit-of-account function of money. Older economists like Jevons and Keynes[1] referred to the unit-of-account as the money-of-account, and modern economic historians also prefer money-of-account. Terminological differences aside, in today's post I want to focus on what I'll call from here on in the unit-of-account function of money. Scott's UOA posts often emphasize the idea of separating the unit-of-account function from the me...

The zero-lower bound is the well-known 0% floor that a note-issuing bank hits whenever it attempts to reduce the interest rate it offers on deposits into negative territory. Should the bank drop rates below zero, every single negative yielding deposit issued by the bank will be converted into 0% yielding notes. When this happens, the bank will have lost any ability it once had to vary its lending rate. The ZLB is an artificial construct. It arises from the way the banking system structures the liabilities that it issues, namely cash and deposits. We can modify this structure to either remove the ZLB or find alternative ways to get around it. Much of the discussion over the econblogosphere over the last few years has been oriented around various ways to get below zero. There is another artificial bound, this one to the upside—let's call it the 5% upper bound, or FUB. The FUB is an archaic bound. Up until 1854, the Usury Laws prevented the Bank of England from increasing rates above...

In the comments section of my post on Adam Smith and the Ayr Bank , frequent commenter John S. brought up the real bills doctrine . The phrase real bills doctrine gets thrown around a lot on the internet. To muddy the waters, there are several versions of the doctrine. In this post I hope to dehomogenize the various versions in order to add some clarity. 1. Lloyd Mints's version We may as well start with Lloyd Mints's version, since he coined the phrase real bills doctrine back in 1945 on his way to denouncing the doctrine. Mints taught at the University of Chicago and mentored Milton Friedman. [1] Here is Mints: The real-bills doctrine runs to the effect that restriction of bank earning assets to real bills of exchange will automatically limit, in the most desirable manner, the quantity of bank liabilities; it will cause them to vary in quantity in accordance with the "needs of business"; and it will mean that the bank's assets will be of such a nature that they...

It's interesting to see how after a credit crisis, economists start to take money and banking a bit more seriously. Adam Smith, who experienced his very own credit crisis -- the collapse of the Douglas Heron and Co , or the Ayr Bank, on June 22, 1772 -- is no exception. His views on money and banking became much more nuanced after that event. Ayr Bank had been founded in 1769 in the Scottish town of Ayr. It expanded to Edinburgh and Dumfries, and in only a few short years it had succeeded in wrestling a significant chunk of Scottish banking business from incumbents the Bank of Scotland and the Royal Bank of Scotland. By 1772, according to Checkland, the Ayr Bank supplied 25% of Scotland's bank notes and deposits. In early June 1772 one of Ayr's largest customers, Alexander Fordyce , skipped London for Paris to avoid debt payments. A run on the Ayr Bank began that precipitated the bank's failure by the end of the month. Upon observing the bank run, David Hume writes from...

A few weeks ago, David Beckworth egged me on to write about Somalian currency. I can't resist—it's a fascinating subject. The material I'm drawing on comes from Luther & White (2011), Luther (2012), Symes (2005), and Mubarak (2003) Orphaned banknotes When Somalia collapsed into civil war in January 1991, the doors of the Central Bank of Somalia were blown apart, its safes were blasted, and all cash and valuables were looted.* But something odd happened—Somali shilling banknotes continued to circulate among Somalians. To this day orphaned paper shillings are used in small transactions, despite the absence of any sort of central monetary authority. The strange case of circulating Somali shillings forces us to ask some fundamental questions about money. If the Federal Reserve and all other branches of the US government were to be suddenly swallowed up into the sea, would Fed banknotes, like Somali shillings, continue to be used? What forces conspire to keep coloured ...