
The Libor rate and Prime rate are two essential interest rates in the financial world.
The Libor rate is a benchmark for short-term interest rates, used to determine the interest rates on loans and other financial products.
It's calculated by the British Bankers' Association (BBA) and is based on the rates at which banks lend to each other.
The Prime rate, on the other hand, is the interest rate offered by banks to their most creditworthy customers.
It's usually 3% higher than the Federal Funds rate, which is the interest rate at which banks lend and borrow money from each other.
What Is Libor?
Libor, short for London Interbank Offered Rate, is a benchmark interest rate used to determine the cost of borrowing between banks. It's calculated daily based on the rates at which banks lend to each other.
How Libor Works
Libor is an average derived from the rates at which major banks lend to each other in London's money markets. This process involves a complex calculation that takes into account the borrowing rates of these banks.
Libor is set daily by a panel of banks, which makes it a dynamic rate that can change frequently. The rate is influenced by market conditions and the banks' willingness to lend to each other.
The setting of Libor is more complicated than setting the US Prime Rate, which is typically set at three percentage points above the federal funds rate.
Key Differences
Several key differences exist between LIBOR and the prime rate. One major difference is geography - LIBOR is set in London, while the prime rate is set in the US.
The prime rate is actually achieved in the market for overnight lending among financial institutions, whereas LIBOR is set by a syndicate of investment houses in London each day without a market mechanism.
Fixed
Fixed rates are often associated with stability and predictability. The US Prime Rate is a prime example of a fixed rate, as it typically remains unchanged for extended periods of time.

This is in contrast to floating rates, which can fluctuate constantly. The LIBOR rate is a floating rate that changes frequently.
One key difference between fixed and floating rates is the level of predictability they offer. With a fixed rate, you know exactly how much interest you'll be paying over the life of the loan or investment.
Here's a comparison of fixed and floating rates:
The US Prime Rate is used by consumers, while LIBOR is used primarily by banks. This difference in usage reflects the different purposes these rates serve.
Key Differences
LIBOR and the fed funds rate have distinct differences, starting with geography. The fed funds rate is set in the U.S., while LIBOR is set in London.
Many loans in the U.S. still use LIBOR as their benchmark, including some mortgage rates that are set to "prime" - or LIBOR plus some markup.
The fed funds rate is achieved in the market for overnight lending among financial institutions, while LIBOR is set by a syndicate of investment houses in London each day without a market mechanism.

Banks can borrow from one another or trade eurodollars, which are U.S.-dollar denominated deposits at foreign banks, to meet their reserve requirements or lend excess cash.
For a long time, LIBOR was the most influential benchmark rate in the world, with the Intercontinental Exchange (ICE) group asking large banks how much it would cost them to borrow from another lending institution every day.
LIBOR tends to track the Fed's key interest rate closely, but unlike the prime rate, there were significant divergences between the two during the financial crisis of 2007-2009.
Relationship with Prime Rate
The prime rate and LIBOR rate have a close relationship with the federal funds rate, moving in the same direction. The prime rate is usually considered the rate that a commercial bank offers to its least-risky customers.
The Wall Street Journal asks 10 major banks in the U.S. what they charge their most creditworthy corporate customers, publishing the average on a daily basis. The rate only changes when 70% of the respondents adjust their rate.
The prime rate is usually set 3 percentage points above the federal funds rate, with the two figures moving in virtual lock-step with one another. This means that if the federal funds rate is at 1.5%, the prime rate might be at 4.5%.
Here's a breakdown of the relationship between the prime rate and federal funds rate:
Publication of
The publication of key interest rates is a crucial aspect of understanding the relationship between Libor and the Prime Rate. Libor bank rates are published daily at 11:30am GMT by the British Bankers' Association.
The US Prime Interest Rate, also known as the Wall Street Journal Prime Rate, is published in the Wall Street Journal. This publication provides a clear and consistent source of information for tracking the Prime Rate.
Libor, on the other hand, is published by the British Bankers' Association, making it a distinct entity from the Prime Rate in terms of publication.
Relationship
The relationship between the prime rate and the federal funds rate is quite interesting. The prime rate is usually set 3 percentage points above the federal funds rate, which means that if the federal funds rate is at 1.5%, the prime rate is likely to be at 4.5%. This close relationship between the two rates is why they often move in the same direction.
In fact, the prime rate is considered the rate that a commercial bank offers to its least-risky customers, and it's set by the Wall Street Journal's daily survey of major banks. Each bank sets its own prime rate, but the average consistently hovers at 3 percentage points above the federal funds rate.
The prime rate is used as a benchmark for many other rates, including credit card rates. If you have average credit, your credit card may charge prime plus, say, 6 percentage points, which means you'll be paying 10.5% on your revolving credit line. If the federal funds rate is low, you'll enjoy lower borrowing costs almost immediately.
Here's a rough estimate of how the prime rate and federal funds rate are related:
Keep in mind that this is just an estimate, and the actual prime rate may vary depending on the bank and the individual's creditworthiness.
Interest
The interest rate is a crucial aspect of the LIBOR rate vs prime rate debate. The Fed's key interest rate is set by buying or selling government securities on the open market, which dictates the price of borrowing among commercial banks.
This process is done to either boost or slow down the economy. For instance, if the Fed wants to give the economy a boost, it buys government securities, adding cash to the system and reducing the rate for overnight lending among commercial banks.
The required reserve percentage also plays a role in influencing economic growth, but it's not a very common approach by the Fed due to its potential for a bigger impact than desired.
LIBOR, on the other hand, was the main rate for short-term borrowing transactions before being discontinued in 2023. It was based on eurodollars, which are U.S.-dollar-denominated deposits at foreign banks.
Before its discontinuation, LIBOR was calculated by the Intercontinental Exchange group by asking large banks how much it would cost them to borrow from another lending institution every day. The filtered average of the responses represented LIBOR.
Eurodollars come in various durations, resulting in multiple LIBOR benchmark rates, such as one-month LIBOR and three-month LIBOR.
LIBOR tended to track the Fed's key interest rate closely, but there were significant divergences between the two during the financial crisis of 2007 to 2009.
The financial upheaval of 2008 led to an unusual divergence between LIBOR and the funds rate, with LIBOR jumping more than a full percentage point overnight for some homeowners with adjustable-rate mortgages.
Current Libor Rate
The current Libor rate is 6.50%. I couldn't find a specific effective date for this rate in the provided information, but it's essential to note that Libor rates can fluctuate frequently.
The difference between Libor and Prime rates is significant, with the Prime rate being 2% higher than the current Libor rate.
Understanding Libor
LIBOR is a benchmark rate that leading global banks charge each other for short-term loans.
It's calculated for five currencies and different periods ranging from one day to one year.
LIBOR is determined by the equilibrium between supply and demand on the funds market, unlike the federal funds rate which is set by the U.S. Federal Reserve.
This means LIBOR reflects the rate at which banks are willing to lend and borrow money from each other.
LIBOR is calculated for different periods, making it a versatile benchmark for various financial transactions.
Frequently Asked Questions
What is the difference between LIBOR and Fed funds rate?
The Fed funds rate affects overnight lending between US banks, while LIBOR influences global borrowing costs between banks, impacting a wide range of financial products worldwide. This key difference reflects their distinct roles in shaping the global and domestic financial markets.
Sources
- https://strategiccfo.com/articles/banking-financing/libor-versus-prime-rate/
- https://www.investopedia.com/articles/investing/060214/what-relationship-between-federal-funds-prime-and-libor-rates.asp
- https://www.wilmerhale.com/en/insights/client-alerts/20231026-libor-fallback-to-prime-may-increase-corporate-loan-costs
- https://www.investopedia.com/ask/answers/072715/what-are-differences-between-federal-funds-rate-and-libor.asp
- https://smallbusiness.chron.com/libor-vs-prime-rate-65560.html
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