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Models
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VAR
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var
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Mapa Mental por
Chloe Curtis
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Chloe Curtis
hace alrededor de 8 años
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Resumen del Recurso
Models
VAR
Single asset class
Bell curve
Normal market conditions
Exacerbate diversification
Separate lending and risk
Fundamental rules of banking: default risk is inevitable liability of business
Turner Review
ST observation period.
Network risks-> self enforcing cycles.
Paradox: Systemic risk highest when measured risk lowest
Take on more risk
Risk vs uncertainty and systemic vs idiosyncratic
Apotheosis of 50 years of FE.
Complete fallacy-> blind faith in models.
Net risk less than risk of either two investments.
Endogenous risk e.g. uncertainty.
Gaussian Copula
Simple elegant ease accuracy ubiquitous
Spark of mathematical legerdemain
CDS prices-> implicit assumption price risk correctly.
No look at underlying
Constant correlation rather than mercurial.
Taleb- charlatanism.
Black boxes.
Regulators risk measures derived from model
Legitimacy
Conformity-> compounded risk.
Robhini
Not black swan-> white swan events remarkable predictable.
Enthusiastically embraced 20% yearly increase in prices.
Frank Knight
Uncertainty cannot be priced
Fama
Markets are utterly rational and efficient.
Random walk became conventional wisdom.
My View
Religious faith in models
Financial wizards carried away in euphoria
During market upheaval 'all correlations go to one'.
Exacerbated by one stop shop
Stiglitz
1987 'Once in a lifetime crash-> one in every billion years.
10 years later LCTM.
Financial markets do not learn-> people running models do not look at history.
Rajan
Linkages between markets and institutions.
Exposed to large systemic shocks.
Fat tail risks.
Keynes
Future inherently unpredictable-> no mode.
Euphoria leads to SS.
PA Problem
Moral hazard.
Myopic destructive incentives
Copycat behaviour e.g. Asch visual experiment feel left out.
Crazy ones those not in market.
Cassidy
Market strong self-equalibvrating tendencies.
GD historic anomaly-> error of MP converting recession into cataclysm
Disaster Myopia
Representative Heuristic
Rational irrationality
Prisoners dilemma
Drunks staggering down the street
Synchronous lateral excitation
Samuelson
Physics of avalanches
No equilibrium relaitons-> economic dislocations.
Displace snow in path which adds weight and force
Mansharamani
LCTM never had a monthly loss greater than 3% prior to 1998.
Likelihood 1 in 50 million.
Over/undershooting no unique equilibrium no self correcting self reinforcing.
Low cross regional correlation.
LCH
Take no account of most important determinant-> self control.
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