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Roland Beck, Risk Analysis Group
The CDS market: A primer Including computational remarks on “Default Probabilities online”
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Folie 2
The CDS market: A primer
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Credit Default SwapsShort Introduction
– CDS are similar to buying insurance against default or covered credit events
– Protection buyer pays so called default swap premium, usually expressed in basis points
– If specified event (mostly default) is triggered, protection seller covers occurred losses
– In practice, buyer delivers specific predefined asset (bonds, loans) to seller and receives 100% of the notional specified in the CDS contract
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CDS: Methods of Settlement
– Physical delivery of the reference security– Physical delivery of equivalent asset– Cash Settlement
Example, Argentine plain vanilla bond, actual price = 20
Physical settlement: Protection buyer delivers reference security, protection seller has to pay 100Cash settlement: Protection buyer receives 100-20 = 80 from protection seller and keeps security
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Credit Default SwapsHistoric Market Development
– Since early 1990’s CDS market evolved into a major component of capital markets
– Removal of current regulatory uncertainty (Basle II) is expected to lead to further rapid market growth
– Sovereign CDS benefited from standardisation in ’98/’99 as well as successful execution in recent defaults
Elimination of Argentine reference assets after default in 2001
-40%
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Credit Default SwapsEmerging Markets Focus
– Emerging Markets are relatively small in absolute size
– Strong focus on Sovereign CDS as they are considered the most liquid derivatives in Emerging Markets
– Market liquidity generally shows strong dependency on liquidity of respective bond markets
– Emerging Markets Sovereign CDS are highly concentrated in relatively few names (Top 7 account for 50% of total market)
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Credit Default SwapsLatin America – Brazil bond spreads and external factors
Oct ’97 – Asian crisis hits Indonesia, Japan and Korea
Jan ’99 – BRL allowed to move freely, markets rally Jul ’02 – BRL at all-time low,
financial markets panic
Oct ’02 – Lula da Silva wins presidential elections
Apr ’04 – Greenspan announces possibility of Fed rate increase
Mid ’98 – Russian crisis emerges
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Credit Default SwapsBrazil – CDS as Early Warning Indicator
– CDS movements generallyleading bond spread movements
– Applies especially for longer term changes in Sovereign risk
– CDS liquidity and volumes tend to increase in view of looming crisis while bond market activity tends to shrink/dry up
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Brazil 09 CDS Brazil
Mid ’02 – Pre-election crisis Apr ’04 – Greenspan
announces possibility of Fed rate increase
Spread Comparison Brazil ’09 vs. 5y CDS
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CDS spreads versus bond spreadsShortcomings in imperfect markets
– No arbitrage conditions should exist– Credit risk prices for bonds and CDS are equal over the long term– Price differentials can appear due to:
Information unrelated to the credit risk is priced in, especially liquidityContractual arrangements, i.e. Sovereign CDS mostly use old ISDA ’99 restructuring clausesAccrued interest premium for CDSCheapest to deliver option for protection buyerCDS spreads are quoted on Act/360 basis while bond spreads are quoted o 30/360 basis
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Computational remarks on “Default Probabilities online”
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What are CDS spreads?
Definition: CDS spread = Premium paid by protection buyer to the seller
Quotation: In basis points per annum of the contract’s notional amount
Payment: Quarterly
Example: A CDS spread of 593 bp for five-year Brazilian debt means that default insurance for a notional amount of USD 1 m costs USD 59,300 p.a. This premium is paid quarterly (i.e. 14,825 per quarter).
Note: Concept of CDS spread (insurance premium in % of notional)
≠ Concept of yield spread (yield differential of a bond over US Treasury yield)
However: Arbitrage ensures that CDS spread ≈ bond yield spread
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How do CDS spreads relate to the probability of default?The simple case
Consider a 1-year CDS contract and assume that the total premium is paid up front
Let S: CDS spread (premium), p: default probability, R: recovery rate
The protection buyer expects to pay: S
His expected pay-off is (1-R)p
When two parties enter a CDS trade, S is set so that the value of the swap transaction is zero, i.e.
S=(1-R)p ↔ S/(1-R)=p
If R=25%, a spread of 500 bp translates into p =6.6%.
If R=0, we have S=p=5%.
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How do CDS spreads relate to the probability of default?The real world case
Consider now the case where
Maturity = N years
Premium is paid in fractions di (for quarterly payments di =0.25)
Cash flows are discounted with a discount factor from the U.S. zero curve D(ti)
For convenience, let
q=1-p
denote the survival probability of the reference credit with a time profile
q(ti), i=1…N
Assume that there is no counterparty risk.
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Valuation of a CDS contract in the real world case
With proper discounting and some basic probability math, you get
)1(2
]payments fixed[
dates paymentsbetween occursdefault if payments premium Accrued
1
occursdefault no if payments premium Discounted
11 4444 34444 2144 344 21
iiiiiii
d)}Sq(t)){q(t(tD)Sd)q(tD(tPVN
i
N
i
−∑+∑= −
==
)2()}()({)( )1(payments] contingent[1 period respect.in default of Prob.
1
paymenton Compensati
∑=
− −−=N
iiii tqtqtDRPV44 344 21321
Note that the two parties enter the CDS trade if the value of the swap transaction is set to zero, i.e. (1)=(2)