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Libor

Libor is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Libor rather than just read about it. In short: The London Inter-Bank Offered Rate (Libor LY-bor) was an interest rate average calculated from estimates submitted by the leading banks in London. Each bank estimated what it would be charged were it to borrow from other banks.

Libor — main illustration
Libor — illustration

Key takeaways

  • Libor belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Libor to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Libor from memory before moving on to harder problems.

Reference excerpt

The London Inter-Bank Offered Rate (Libor LY-bor) was an interest rate average calculated from estimates submitted by the leading banks in London. Each bank estimated what it would be charged were it to borrow from other banks. It was the primary benchmark, along with the Euribor, for short-term interest rates around the world. Libor was phased out at the end of 2021, with market participants encouraged to transition to risk-free interest rates such as SOFR and SARON. LIBOR was discontinued in the summer of 2023. The last rates were published on 30 June 2023 before noon UK time. The 1 month, 3 month, 6 month, and 12 month Secured Overnight Financing Rate (SOFR) is its replacement. In July 2023, the International Organization of Securities Commissions (IOSCO) said four unnamed dollar-denominated alternatives to LIBOR, known as "credit-sensitive rates", had "varying degrees of vulnerability" that might appear during times of market stress. Libor rates were calculated for five currencies and seven borrowing periods, ranging from overnight to one year, and were published each business day by Thomson Reuters. Many financial institutions, mortgage lenders, and credit card agencies set their own rates relative to it. At least $350 trillion in derivatives and other financial products were tied to Libor. In June 2012, multiple criminal settlements by Barclays Bank revealed significant fraud and collusion by member banks connected to the rate submissions, leading to the Libor scandal. The British Bankers' Association said on 25 September 2012 that it would transfer oversight of Libor to UK regulators, as proposed by Financial Services Authority managing director Martin Wheatley's independent review recommendations. Wheatley's review recommended that banks submitting rates to Libor must base them on actual inter-bank deposit market transactions and keep records of those transactions, that individual banks' Libor submissions be published after three months, and recommended criminal sanctions specifically for manipulation of benchmark interest rates. Financial institution customers may experience higher and more volatile borrowing and hedging costs after implementation of the recommended reforms. The UK government agreed to accept all of the Wheatley Review's recommendations and press for legislation implementing them. Significant reforms, in line with the Wheatley Review, came into effect in 2013 and a new administrator took over in early 2014. The British government regulated Libor through criminal and regulatory laws passed by Parliament. In particular, the Financial Services Act 2012 brought Libor under UK regulatory oversight and created a criminal offence for knowingly or deliberately making false or misleading statements relating to benchmark-setting.

Introduction The London Interbank Offered Rate (LIBOR) came into widespread use in the 1970s as a reference interest rate for transactions in offshore Eurodollar markets. In 1984, it became apparent that an increasing number of banks were trading actively in a variety of relatively new market instruments, notably interest rate swaps, foreign currency options and forward rate agreements. While recognizing that such instruments brought more business and greater depth to the London Inter-bank market, bankers worried that future growth could be inhibited unless a measure of uniformity was introduced. In October 1984, the British Bankers' Association (BBA)—working with other parties, such as the Bank of England—established various working parties, which eventually culminated in the production of the BBA standard for interest rate swaps, or "BBAIRS" terms. Part of this standard included the fixing of BBA interest-settlement rates, the predecessor of BBA Libor. From 2 September 1985, the BBAIRS terms became standard market practice. BBA Libor fixings did not commence officially before 1 January 1986. Before that date, however, some rates were fixed for a trial period commencing in December 1984. Member banks are international in scope, with more than sixty nations represented among its 223 members and 37 associated professional firms as of 2008. Seventeen banks for example contributed at one point to the fixing of US Dollar Libor. The panel contains the following member banks:

Bank of America Bank of Tokyo-Mitsubishi UFJ Barclays Bank Citibank NA Credit Agricole CIB Credit Suisse Deutsche Bank HSBC JP Morgan Chase Lloyds Banking Group Rabobank Royal Bank of Canada Société Générale Sumitomo Mitsui Banking Corporation Europe Ltd Norinchukin Bank Royal Bank of Scotland UBS AG

Scope Libor was widely used as a reference rate for many financial instruments in both financial markets and commercial fields. There were three major classifications of interest rate fixings instruments, including standard inter-bank products, commercial field products, and hybrid products that often used Libor as their reference rate. Standard interbank products:

Forward rate agreements Interest rate futures, e.g. Eurodollar futures Interest rate swaps Swaptions Overnight indexed swaps, e.g. Libor–OIS spread Interest rate options, Interest rate cap and floor Commercial field products:

Floating rate notes Floating rate certificates of deposit Syndicated loans Variable rate mortgages Term loans Hybrid products:

… excerpt ends here. Continue reading the full article.

Illustrations

Libor: Libor gets its name from the City of London.
Libor gets its name from the City of London.

Worked examples

Example 1 — a first encounter with Libor

Start with the simplest possible case. Write down what Libor claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Libor before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Libor ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Libor

In research
Libor appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry
Engineering practice reuses Libor in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom
Libor is common in secondary-school and first-year university syllabi. It links to neighbouring topics 1984 introductions, Banking, Economy of London, so understanding it makes those chapters shorter.
In everyday life
Look for Libor outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.
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How to study Libor in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Libor means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Libor out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Libor in simple terms?

The London Inter-Bank Offered Rate (Libor LY-bor) was an interest rate average calculated from estimates submitted by the leading banks in London. Each bank estimated what it would be charged were it to borrow from other banks.

Why does Libor matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Libor?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Libor.

Tags

  • 1984 introductions
  • Banking
  • Economy of London
  • Interest rates
  • Reference rates
  • Swaps (finance)
  • United States housing bubble

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