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Why and How Should the Libor Be Reformed?

5 Pages Posted: 27 Jun 2012  

Rosa M. M. Abrantes-Metz

Global Economics Group, LLC; New York University - Leonard N. Stern School of Business - Department of Economics

Date Written: June 26, 2012


Over the last year, large-scale investigations have been launched around the world on allegations of possible collusion and manipulation of the London Interbank Offered Rate (“Libor”).

The Libor has been called “the world’s most important number.” It is a primary benchmark for global short-term interest rates; the Libor is used as the basis for settlement of interest rate contracts on many of the world’s major futures and options exchanges as well as most over-the-counter and lending transactions with an estimated value of U.S. $350-$400 trillion contracts, instruments and transactions referencing it.

The Libor is supposed to measure the rate at which large banks can borrow unsecured funds from other banks at various short-term maturities, and for a variety of currencies. The U.S. dollar-denominated Libor, for example, was set as follows until recently: On a daily basis, the 16 participating banks are surveyed by the British Bankers Association (BBA) and submit sealed quotes which answer: “[a]t what rate could you borrow funds, were you to do so by asking for and then accepting interbank offers in a reasonable market size just prior to 11:00 a.m. London time?” The Libor is then computed by averaging over the middle eight quotes and disregarding the four highest and the four lowest.

Following the launch of these investigations and the discovery of documents which suggest that manipulation and collusion may have taken place, some are now calling for a comprehensive reform of the Libor. Still others, however, are reluctant to reform the Libor system, arguing that it is not fundamentally broken and reforms may prove more disruptive than helpful.

In this article I review what I believe are the inherent problems in the structure of the Libor process and put forward a proposal for its reform.

Keywords: Libor, Reform, Screens, Manipulation, Conspiracy

JEL Classification: C10, G14, G24,K20

Suggested Citation

Abrantes-Metz, Rosa M. mname, Why and How Should the Libor Be Reformed? (June 26, 2012). Available at SSRN: or

Rosa M. Abrantes-Metz (Contact Author)

Global Economics Group, LLC ( email )

22 Cortlandt Street
Suite 1600
New York, NY 10007
United States
(917) 499-4944 (Phone)


New York University - Leonard N. Stern School of Business - Department of Economics ( email )

269 Mercer Street
New York, NY 10003
United States

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