robert engle stern school of business siepr february 26,2009 what is happening to financial market...
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Robert Engle
Stern School of Business
SIEPR February 26,2009
WHAT IS HAPPENING TOFINANCIAL MARKETVOLATILITY AND WHY?
WHAT IS HAPPENING TOFINANCIAL MARKETVOLATILITY AND WHY?
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RISK
• A Risk is a bad future event that might happen.
• Some risks can be avoided completely. • But some risks are worth taking because the
possible benefit exceeds the possible costs.• Finance investigates which risks are worth
taking.
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NOBEL ANSWERS
• Markowitz (1952) and Sharpe(1964) and Tobin (1958) received Nobel awards in 1990 and 1981 for associating risk with the variance of financial returns.
• Capital Asset Pricing Model or CAPM answer: Only variances that could not be diversified would be rewarded.
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BLACK-SCHOLES AND MERTON• Options can be used as insurance policies.
For a fee we can eliminate financial risk for a period.
• What is the right fee?• Black and Scholes(1972) and Merton(1973)
developed an option pricing formula from a dynamic hedging argument. Their answer also satisfies the CAPM.
• They received the Nobel prize in 1997
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IMPLEMENTING THESE MODELS
• Practitioners required estimates of variances and covariances or equivalently volatilities and correlations.
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ESTIMATES DIFFER FOR DIFFERENT TIME PERIODS
• Volatility is apparently varying over time
• What is the volatility now?
• What is it likely to be in the future?
• How can we forecast something we never observe?
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ARCH MODEL
• The ARCH model predicts the variance of returns on the next day.
• It relies on two features of returns– Volatility Clustering– Mean Reversion of Volatility
• Econometric Methods fit this model to data
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Plus and Minus three Sigma
-.100
-.075
-.050
-.025
.000
.025
.050
.075
.100
90 92 94 96 98 00 02 04 06
3*SPVOL SPRET -3*SPVOL
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OBSERVATIONS
• CONFIDENCE INTERVAL IS CHANGING• GREEN CURVE IS APPROXIMATELY VAR• .6% RETURNS EXCEED INTERVAL• LARGEST IS -6.8 SIGMA! (oct 27 1997)• MORE EXTREMES THAN EXPECTED FOR A
NORMAL BUT NOT FOR A STUDENT-T
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DOES THIS WORK IN TURBULENT TIMES?
• ESTIMATE THROUGH 2004
• KEEPING SAME PARAMETERS, FORECAST TO END OF SAMPLE ONE DAY AT A TIME.
• DO WE SEE MULTI-SIGMA MOVES?
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Plus and Minus 3 x sigma using 2004 model
-.15
-.10
-.05
.00
.05
.10
.15
2005 2006 2007 2008
3*DJSD04 DJRET -3*DJSD04
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STANDARDIZED RETURNS SINCE 2004 USING 2004 ESTIMATED MODEL
0
40
80
120
160
200
240
-8 -6 -4 -2 0 2
Series: DJRET/DJSD04Sample 1/03/2005 10/20/2008Observations 956
Mean -0.001066Median 0.063605Maximum 3.004820Minimum -7.536694Std. Dev. 1.053278Skewness -0.665960Kurtosis 5.993653
Jarque-Bera 427.6494Probability 0.000000
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WHAT WAS -7 SIGMA EVENT?
-8
-6
-4
-2
0
2
4
2005 2006 2007 2008
DJRET/DJSD04
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SURPRISING SUCCESS
• Although the original application of ARCH was macroeconomic, the big success was for financial data.
• Why does it work?
• What makes volatility high?
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WHY DO PRICES CHANGE?
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BETTER ANSWER
• Economic news on future values and risks moves prices
• Volatility is the natural response of a financial market to new information.
• News arrives in clusters.
• High volatility means a cluster of important news!
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VOLATILITY
Through February 20,2009VLAB http://vlab.stern.nyu.edu
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S&P 500 GARCH
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ONE YEAR TARCH and VIX
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ADDING YESTERDAY
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RANGE BASED GARCH USING ASYMMETRIC MEM FOR DAX
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CORPORATE BONDS
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MSCI WORLD INDEX
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MSCI EMERGING MARKET INDEX
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COMMODITIES
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ENERGY, FINANCE, TECHNOLOGY
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SECTOR CORRELATIONS
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INTERNATIONAL CORRELATIONS
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WHERE IS VOLATILITY TODAY?
• For most assets, volatility last fall was dramatically above levels since 1990 but is now somewhat lower.
• In the US, I think this is due – A) Macroeconomic uncertainty– B) Credit problems particularly associated
with securitized debt.
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THE SPLINE GARCH MODEL OF LOW FREQUENCY VOLATILITY AND ITS MACROECONOMIC CAUSES
Robert Engle and Jose Gonzalo RangelReview of Financial Studies 2008
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MODEL LOW FREQUENCY VOLATILITY
• For what countries is this greatest?
• For what time periods is it greatest?
• What macroeconomic variables are associated with volatility?
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WHAT MAKES FINANCIAL MARKET VOLATILITY HIGH?
• High Inflation• Slow output growth and recession• High volatility of short term interest rates• High volatility of output growth• High volatility of inflation
• Small or undeveloped financial markets• Large countries
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WERE WE PREPARED?
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THREE VOLATILITY EPISODES
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DOW JONES 1928-2008
-.3
-.2
-.1
.0
.1
.2
30 40 50 60 70 80 90 00
DJRET
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400
200
160
120100
80
60
40
201930 1932 1934 1936 1938 1940
DJCLOSE
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0
20
40
60
80
100
120
1930 1932 1934 1936 1938 1940
VOLCOMP
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DJ VOLATILITY 1980-1990
0
20
40
60
80
100
120
140
160
80 81 82 83 84 85 86 87 88 89 90
DJVOL_COMP
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AND FOR 1998-2008?WHAT CAN WE EXPECT?
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DJ VOLATILITY 1998-2008
0
10
20
30
40
50
60
70
98 99 00 01 02 03 04 05 06 07 08
VOLCOMPPERM
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THE RISK OF WAR and TERRORISM
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A LONG RUN RISK
• Deteriorating Global Economy• Increasing income differential between
rich and poor countries• Rising fundamentalism• Rising social unrest
• Increase the risk of War and Terrorism
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DEPRESSED ASSET PRICES
• Long run risks lower asset prices as investors are more cautious.
• This raises the cost of doing business and raising capital
• This reduces income of entrepreneurs
• And costs jobs
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WHAT TO DO?
PROMOTE PEACE• MANY, MANY APPROACHES THROUGH POLITICS,
SCIENCE, MEDICINE, CULTURE, EDUCATION, LAW• SOME ECONOMIC PROPOSALS:
– TRADE– CAPITAL FLOWS– BUILD ECONOMIC INTERDEPENDENCES– FIGHT POVERTY– REFORM EDUCATION to show value in cooperation
PEACE PERMITS PROSPERITY
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BENEFITS
• Reducing future risk of war
• Yields benefits today by
• Improving business and stock market valuations and
• Creating jobs
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VERY LONG RUN RISKS!ARE WE READY FOR THESE?
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GLOBAL OVERHEATING – WHAT ARE THE RISKS?• Scientific evidence seems clear that the
climate is changing.– CO2 concentrations are rising rapidly
– Glaciers and polar ice are melting– Warmest years on record are almost all within
10 years.
• But what are the costs? Scientific evidence is not precise.
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ECONOMIC COSTS
• THE GLOBAL ECONOMY WILL BE UNABLE TO PRODUCE AS MUCH IN THE FUTURE AS IT WOULD WITHOUT CLIMATE CHANGE
• TAXES WILL BE RAISED TO PAY FOR PUBLIC EFFORTS TO MITIGATE THESE COSTS
• COMPANIES WILL HAVE EXTRA COSTS OF DOING BUSINESS SO PROFITS WILL BE LOWER.
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FINANCIAL MARKET EVALUATION OF CLIMATE RISK. IS CLIMATE RISK PRICED?
• Can we see evidence of climate risk in financial markets?
• We would expect that stock prices would be depressed by climate risk.
• If it is a risk for all stocks, then it would imply simply a lower price.
• If it is more of a risk for some companies or countries than others, then they would have bigger discounts.
• If these risks are not priced, then there could be profitable portfolio strategies.
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A SOLUTION
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A SOLUTION
• Most Economists believe the best solution to global overheating is a comprehensive tax on carbon emissions and other greenhouse gases. – Only if it is comprehensive will it encourage
alternative energy solutions– Only if it is comprehensive will efforts to avoid
the tax be socially beneficial.
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TAX REVENUE MUST BE PART OF THE ANALYSIS
• Send a check to every resident for an equal fraction of the total revenue.– This compensates everyone equally so it offsets the hardship
of an emissions tax for low incomes.
• Send the checks first. – It will enable people to buy fuel efficient cars, insulate homes,
improve appliance efficiency. This will stimulate industries that have been badly hurt by the financial crisis.
• After recession is over, invest passively in a sovereign fund to support social security and public health care.
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High Oil Prices are a Good Thing!
• These encouraged consumers and industry to use less oil– Driving in the US was down– Hybrid Cars were selling and SUV’s were not– House prices in the suburbs were declining
more than in the central city– Ridership on public transportation was up
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But this is Not Enough.
• Oil prices are falling again. • Coal is still a cheap and dirty alternative.• Entrepreneurs with ideas for alternative
energy sources cannot be confident that energy prices will stay high.
• Businesses and Consumers will hesitate before making energy investments
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CONCLUSION
• Make sure you take only the risks you intend to take
• Keep an eye on long run risks
• Policy makers remember: reducing long run risks gives benefits today
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The first European conference will be held in Geneva June 10th, 11th, and 12th, 2009.
Information about submitting papers can be found at the following webpage: http://www.nyu.edu/sofie/
FoundingCouncil
John CampbellFrank DieboldRobert Engle
Ronald GallantRené GarciaJohn GewekeEric Ghysels
Christian Gouriéroux
Clive GrangerLars Peter
HansenWolfgang HärdleRavi Jagannathan
Eric RenaultGeorge TauchenHalbert White
The Society is a global network of academics and practitioners dedicated to the fast-growing field of financial econometrics.
The Society will be associated with the Journal of Financial Econometrics.
The Society for Financial EconometricsThe Society for Financial Econometrics
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