University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
FNCE 4040– Derivatives Chapter 4
Interest Rates
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University of Colorado at Boulder Leeds School of Business FNCE-4040 Derivatives FNCE 4040 Derivatives Chapter 4 Interest Rates University of Colorado at Boulder Leeds School of Business FNCE-4040 Derivatives Goals Discuss
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
FNCE 4040– Derivatives Chapter 4
Interest Rates
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Goals
Derivative Pricing
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Types of Rates
types of interest rates that are relevant –LIBOR –Risk-free rates –Interest Rates on collateral
–Treasuries –Overnight Interest Rate Swaps (OIS)
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LIBOR
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
LIBOR
– This is the rate of interest at which a bank is prepared to borrow from another bank. – It is compiled for a variety of maturities ranging from Overnight to 1 year – It exists on all 5 currencies – CHF, EUR, GBP, JPY and USD – It is compiled once a day ICE Benchmark Administration (IBA)
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LIBOR Process
to the following question “At what rate could you borrow funds, were you to do so by asking and then accepting inter-bank offers in a reasonable market size just prior to 11am London time?”
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Uses of LIBOR
– Interest Rate Futures
paid on 3-Month LIBOR
– Interest Rate Swaps
interest rates generally for three or six month period. The maturity
– Mortgages
– Benchmark rate for short-term borrowing in the market. – There has been a scandal surrounding LIBOR for the past few years. If interested see the appendix.
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RISK FREE RATE
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The Risk-Free Rate
a “risk-free” rate
– The risk-free rate traditionally used by derivatives practitioners was LIBOR – Treasuries are an alternative but were considered to be artificially low for a number of reasons
institutions to satisfy a variety of regulatory requirements. Increases demand and decreases yield
investment in treasury bills and bonds is lower
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
The Risk-Free Rate
risk-free rates exist and they will be given to you.
rate
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Collateral Based Discounting
Collateral Based Discounting
– The yield curve relevant for discounting depends
– Every derivatives contract might have a different yield curve
at least one collateralized example
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THE YIELD CURVE
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Yield Curve
curve.
– Yields to specified maturities, – A methodology for interpolating missing yields, – A methodology for calculating forward rates (rates that are for borrowing/lending starting in the future)
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Theories of the Term Structure
higher than expected future zero rates
long rates determined independently of each
expected future zero rates
– The Derivatives market uses this theory.
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CONTINUOUSLY COMPOUNDED ZERO RATES
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Continuous Compounding
interest rate is the unit of measurement
compounding frequency results in a higher value of the investment at maturity
continuously compounded zero rates
– Except when we are discussing a specific instrument or market – for example LIBOR or swap rates.
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Continuous Compounding
interest earned on an investment that provides a payoff only at time T
is instantaneously reinvested.
– $100 grows to $100 × 𝑓𝑆𝑑𝑈 when invested at a continuously compounded rate 𝑆𝐷 to time 𝑈 – Conversely, $100 paid at time 𝑈 has a present value of $100 × 𝑓−𝑆𝑑𝑈, when the continuously compounded discount rate to time 𝑈 is 𝑆𝑑
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Practice
Maturity (years) Continuously Compounded Zero Rate Present Value Future Value
1 4.0000% 961 1,000 2 3.0000% 2,000 2,124 1.5 6.0000%
3 1.5000% 4,000 4,184
Remember: PV = 𝐺𝑊 ∗ 𝑓−𝑆𝑑𝑈
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Other Interest Rates
rates involves a daycount convention.
– ACT/360 – The interest owed is 𝑠𝑏𝑢𝑓 × 𝐵𝑑𝑢𝑣𝑏𝑚 𝐸𝑏𝑧𝑡 𝑗𝑜 𝑞𝑓𝑠𝑗𝑝𝑒 360 – ACT/365 – The interest owed is 𝑠𝑏𝑢𝑓 × 𝐵𝑑𝑢𝑣𝑏𝑚 𝐸𝑏𝑧𝑡 𝑗𝑜 𝑞𝑓𝑠𝑗𝑝𝑒 365
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives Start (days) End (days) Rate Daycount Basis Notional Interest
365 3.00% 360 1,000,000 30,417 365 4.00% 365 1,000,000 40,000 182 365 3.00% 360 1,000,000 15,250 180 290 2.00% 365 1,000,000 6,027
Practice
𝐽𝑜𝑢𝑓𝑠𝑓𝑡𝑢 = 𝑂𝑝𝑢𝑗𝑝𝑜𝑏𝑚 × 𝑠𝑏𝑢𝑓 × 𝐵𝑑𝑢𝑣𝑏𝑚 𝐸𝑏𝑧𝑡 𝑗𝑜 𝑞𝑓𝑠𝑗𝑝𝑒 𝐸𝑏𝑧𝑑𝑝𝑣𝑜𝑢
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Conversion
form and have to convert to another.
return from the given rate and using this to compute the unknown rate, or equating PVs: 𝑓𝑠𝑑𝑑∗𝑒𝑏𝑧𝑡/365 = 1 + 𝑠
𝐵𝐷𝑈/360
𝑒𝑏𝑧𝑡 360 𝑄𝑊 = 𝑓−𝑠𝑑𝑑∗𝑒𝑏𝑧𝑡/365 = 1 1 + 𝑠
𝐵𝐷𝑈/360 𝑒𝑏𝑧𝑡
360
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Practice
Start End ACT/360 Rate ACT/365 Rate
Rate
365 3.00% 3.0417% 2.9963% 365 4.00% 4.0556% 3.9755% 182 365 3.00% 3.0417% 3.0187%
1 + 𝑠
𝐵𝐷𝑈/360
𝑒𝑏𝑧𝑡 360 = 1 + 𝑠
𝐵𝐷𝑈/365
𝑒𝑏𝑧𝑡 365 = 𝑓𝑠𝑑𝑑∗𝑒𝑏𝑧𝑡/365
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INTERPOLATION BETWEEN RATES
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Interpolation
linearly interpolate continuously compounded zero rates.
– It is easy to explain and implement – It has great risk properties
in the market.
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Linear Interpolation
rates 𝑨1 and 𝑨2 for two times 𝑢1 and 𝑢2 then for time 𝑢 between 𝑢1 and 𝑢2 we define 𝑠 𝑢 = 𝑠
1 + 𝑠2 − 𝑠 1
𝑢2 − 𝑢1 𝑢 − 𝑢1
𝑢1 𝑢2 𝑠
1
𝑠2 𝑢
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Practice
Time 1 years Rate 1 cc zero Time 2 years Rate 2 cc zero Maturity years Rate
1 4.0000% 2 5.0000% 1.5 4.500% 1.5 2.0000% 2 1.5000% 1.8 1.700% 2 1.0000% 3 2.0000% 2.2 1.200%
𝑠 𝑢 = 𝑠
1 + 𝑠 2 − 𝑠 1
𝑢2 − 𝑢1 𝑢 − 𝑢1
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
FORWARD RATES
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Forward Rates
implied by today’s term structure of interest rates
𝑓𝑔
𝑜×(𝑈 2−𝑈 1)
𝑓𝑆2×𝑈
2
𝑓𝑆1×𝑈
1
𝑓𝑆1×𝑈
1𝑓𝑔
𝑜×(𝑈 2−𝑈 1) = 𝑓𝑆2×𝑈
2
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Formula for Forward Rates
T1 and T2 are R1 and R2 with both rates continuously compounded
T1 and T2 is
1 2 1 1 2 2
T T T R T R
rates are not expressed with continuous compounding
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Practice
Time 1 years Rate 1 cc zero Time 2 years Rate 2 cc zero Forward Rate between 𝒖𝟐 and 𝒖𝟑
1 4.0000% 2 5.0000% 6.0000% 1.5 2.0000% 2 1.7500% 1.0000% 2 1.0000% 3 2.0000% 4.0000%
𝐺
1,2 = 𝑆2𝑈2 − 𝑆1𝑈 1
𝑈2 − 𝑈
1
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RISK
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Industry Calc. of Rate Sensitivity: dv01
1bp increase in rates
dollar change dv01
– Shock interest rates by 1bp at various tenor buckets – Compute dollar impact of each individual shock – You obtain a term structure of dv01s
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Example
$1,000,000 in 1-years time. The one-year continuously compounded zero rate is 3.00%.
𝑄𝑊 = $1,000,000 ∙ 𝑓−0.03 = $970,446.53
then the new PV will be: 𝑄𝑊 = $1,000,000 ∙ 𝑓−0.0301 = $970,348.49
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Practice
Amount C.C. Zero rate Maturity Original PV Bumped PV dv01 1,000,000 3.000% 1 $ 970,445.53 $ 970,348.49 $(97.04) 1,000,000 4.000% 1 $ 960,789.44 $ 960,693.37 $(96.07) 1,000,000 3.000% 2 $ 941,764.53 $ 941,576.20 $(188.33)
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
FORWARD RATE AGREEMENT
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Forward Rate Agreement (FRA)
agreement such that a certain interest rate will apply to either borrowing or lending a principal over a specified future period of time.
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
Example
for 1 year starting in 1 year at an interest rate
daycount basis.
Year 1
Year 2
today 1𝑛 𝑉𝑇𝐸 1𝑛 𝑉𝑇𝐸 $1𝑛 365 360 3.00% = 30,416.67
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FRA Mechanics / Valuation – part 1
1 to 𝑈2 at an agreed rate 𝑆𝐿
1 to 𝑈2
– For an FRA 𝐸 =
𝐸𝑏𝑧𝑡 𝑈
2 −𝐸𝑏𝑧𝑡(𝑈 1)
360
𝑈
1
𝑈2
today
Interest owed:
𝑂 × 𝑆𝐿 × 𝐸
𝑂 𝑂
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𝑄𝑊 = −𝑂 ∙ 𝑓−𝑠1𝑈
1 + 𝑂 ∙ 1 + 𝑆𝐿 ∙ 𝐸 ∙ 𝑓−𝑠2𝑈 2
FRA Mechanics / Valuation – part 1
compounded zero rates 𝑠
1 and 𝑠2.
𝑈
1
𝑈2
today
Interest owed:
𝑂 ∙ 𝑆𝐿 ∙ 𝐸
𝑂 𝑂
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The Fair FRA Rate
sum of the PV of both cash flows is zero: 𝑂𝑓−𝑠1𝑈
1 = 𝑂 1 + 𝑆𝐺𝐸 𝑓−𝑠2𝑈 2
𝑓−𝑠1𝑈
1 = 1 + 𝑆𝐺𝐸 𝑓−𝑠2𝑈 2
𝑆𝐺 = 𝑓 𝑠2𝑈
2−𝑠1𝑈 1 − 1
𝐸
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The Fair FRA Rate
1 to 𝑈2
at an agreed rate 𝑆𝐿 with daycount fraction 𝐸 from 𝑈
1 to 𝑈2 is
𝑄𝑊 = −𝑂𝑓−𝑠1𝑈
1 + 𝑂 1 + 𝑆𝐿𝐸 𝑓−𝑠2𝑈 2
from the previous page and obtain: 𝑄𝑊 = −𝑂 1 + 𝑆𝐺𝐸 𝑓−𝑠2𝑈
2 + 𝑂 1 + 𝑆𝐿𝐸 𝑓−𝑠2𝑈 2
𝑸𝑾 = 𝑶 𝑺𝑳 − 𝑺𝑮 𝑬𝒇−𝒔𝟑𝑼𝟑
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Forward Rate Agreement (cont.)
a predetermined rate, RK is exchanged for interest at the market rate
rate RF, is certain (has been discovered)
difference between:
– the interest that would be paid at rate RF and – the interest that has to be paid at rate RK
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FRA Mechanics / Valuation – part 2
1 to 𝑈2
𝑈
1
𝑈2
Fair rate now for period 𝑈
1, 𝑈2 = 𝑆𝐿
today Interest owed:
𝑂 × 𝑆𝐿 × 𝑈2 − 𝑈
1
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Think of Mark-To-Market as the cost to offsetting your position
FRA Mechanics / Valuation – part 2
Interest owed:
𝑂 × 𝑆𝐿 × 𝑈2 − 𝑈
1
𝑓−𝑆2×𝑈
2
𝑈
1
𝑈2
today Fair rate for period 𝑈
1, 𝑈2 moves to 𝑺𝑮
Interest now prevailing:
𝑂 × 𝑺𝑮 × 𝑈2 − 𝑈
1
Take the difference and PV
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
FRA example 1
for 1 year starting in 1 year at an interest rate
daycount basis.
Maturity Continuously Compounded Zero Rate 1 2.50% 2 2.60%
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives cc zero PV 2.50%
2.60% 978,205
FRA example 1 – Cashflows
Year 1
Year 2
today 1𝑛 𝑉𝑇𝐸 1𝑛 𝑉𝑇𝐸 $1𝑛 365 360 3.00% = 30,416.67
Maturity Cashflow 1
2 1,030,417 𝑄𝑊 = 978,205 − 975,310 = 2,895
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FRA example 2
for 1 year starting in 1 year at the fair FRA
daycount basis. At what rate do they lend?
Maturity Continuously Compounded Zero Rate 1 2.50% 2 2.60%
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
FRA - example 2
𝑔 = 2.60% ∙ 2 − 2.50% ∙ 1 2 − 1 = 2.70%
𝑓2.70%∙365 365 = 1 + 𝑠 365 360 𝒔 = 𝟑. 𝟕𝟘𝟘𝟒%
Maturity Continuously Compounded Zero Rate 1 2.50% 2 2.60%
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives cc zero PV 2.50%
2.60% 978,205
Combine the two examples
Maturity Cashflow 1
2 1,030,417
𝑄𝑊 = 978,205 − 975,310 = 2,895
Remember we computed the PV for example 1 We also worked out the PV of the FRA given the fair rate. In example 2 we computed the fair rate (we used the same interest rates intentionally), plug that fair rate and compute the PV again: 𝑄𝑊 = 𝑂 𝑆𝐿 − 𝑆𝐺 𝐸𝑓−𝑠2𝑈
2
= $1𝑛𝑛 ∗ 3.00% − 2.6993% 365 360 ∗ 𝑓−2.6%∗2 = $2,895
Fair rate 𝑠 = 2.6993%
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
“Floating” FRA
prevail on a date 𝑈
1 for the period 𝑈 1, 𝑈2
for the period 𝑈
1, 𝑈2 that will be determined
at (some time 𝑈𝐿 between now and) time 𝑈
1”
be fair at some point in the future”
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RISK ON AN FRA
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DV01
interest rate risk is the dv01 aka dollar value
𝑄𝑊 = −𝑂𝑓−𝑠1𝑈
1 + 𝑂 1 + 𝑆𝐺𝐸 𝑓−𝑠2𝑈 2
We can see that there are two interest rates used in pricing an FRA: 𝑠
1 and 𝑠2
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Heuristics
already been entered.
1 by a basis point and leave 𝑠2
constant then the lender of money makes money
1
constant then the lender of money loses money
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
More Heuristics
𝑆𝐺 = 𝑓 𝑠2𝑈
2−𝑠1𝑈 1 − 1
𝐸 and 𝑄𝑊 = 𝑂 𝑆𝐿 − 𝑆𝐺 𝐸𝑓−𝑠2𝑈
2
lender loses money.
depends on the sign of the PV to being with.
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University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives
DERIVING CONTINUOUSLY COMPOUNDED RATES
Appendix
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Measuring Interest Rates
interest rate is the unit of measurement
compounding comes that in the latter you earn interest on interest throughout the year
compounding frequency results in a higher value of the investment at maturity
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Impact of Compounding
𝑆, A grows to A(1 + 𝑆/𝑛)𝑛 in one year
Value of $100 in 1year at 10% Annual (m=1) 110.00 Semi-annual (m=2) 110.25 Quarterly (m=4) 110.38 Monthly (m=12) 110.47 Weekly (m=52) 110.51 Daily (m=365) 110.52
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Continuous Compounding
the interest earned grows exponentially
University of Colorado at Boulder – Leeds School of Business – FNCE-4040 Derivatives S
x T N x N T / *
Let r=rate and x=compounding time →
N
x r x r x r * 1 * 1 * 1 Value End
times N g compoundin
N
x r N
e x r
* 1 ln x x
lim * 1 lim
How to derive Rc
Substitute N=T/x
x x r T
e
* 1 ln x
lim
x dx d x r T dx d
e
* 1 ln x
lim
rT r x r T
e e
1 * 1 1 x
lim
Looks like 0/0. Use de l’Hôpital
Q.E.D.
Make x very
use A=eln(A)
Checks: r=0 →End Value=1 T=0 →End Value=1
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Continuous Compounding
more frequently, we obtain continuously compounded interest rates
a continuously compounded rate R for time T
PV=$100 × 𝑓−𝑆𝑑𝑈, when the continuously compounded discount rate is 𝑆𝑑
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US TREASURY MARKET
Appendix
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Treasury Rates
government in its own currency
combination of credit and economic considerations
Many interesting links, for example:
Treasury http://www.treasury.gov/resource-center/data-chart-center/interest-rates/Pages/Historic-Yield-Data-Visualization.aspx Bloomberg http://www.bloomberg.com/markets/rates-bonds/government-bonds/us/ Stockcharts http://stockcharts.com/freecharts/yieldcurve.html
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US Treasury Market
issued by the US Treasury
– T-bills
– T-notes
maturities
– T-bonds
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US Public Debt
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US Public Debt
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US Public Debt
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US Public Debt
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T-bills
𝑄𝑊 = $100 × 1 − 𝑠 𝑒𝑏𝑧𝑡 360
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T-notes and T-bonds
bonds is simply the maturity
–Minimum denomination = $100. –Pays interest every 6 months. If the coupon rate is 𝑠 then the interest paid is 𝑠 2 every 6 months. –At maturity the notional of the note is paid to the holder
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Treasury Strips
Principal of Securities
individual interest and principal components
a known payment on a specific future date
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Treasury Strips
choice when building a Treasury yield curve
– It is quoted as a price. This simplifies the mathematics – Frequent maturities.
treasury so in practice would not choose to use these.
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LIBOR SCANDAL
Appendix
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LIBOR Scandal
– During the financial crisis there was no inter-bank lending market – The answer to the daily questions should have been “At no rate.” or – Maybe another bank would lend money at an extortionate rate.
market found out that they didn’t think they could borrow money from other banks? Or that they answered the question with a 50% rate?
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LIBOR Scandal
– Imagine a 10m USD bet on 3-month USD
– What happens if on the morning of the bet LIBOR is trading at 2.98%? What can a trader do to win the bet?
bank to give a higher submission
the same.
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LIBOR Scandal
– Barclay’s Bank paid fines of GBP290m for manipulation of the rates – Chairman and CEO resigns
– UBS is fined a total of USD1.5bn
– Royal Bank of Scotland expecting penalties of USD 612m
– 6 financial institutions in Europe fined by European Commission 70-260m EUR. – UBS avoided fines of 2.5bn EUR by revealing the existence of cartels.