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![Page 1: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/1.jpg)
Climate Change and the Financial Crisis
Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum
Workshop on Coupled Climate-Economics Modelling and Data Analysis
ENS, Paris, 22-23 Nov 2012
![Page 2: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/2.jpg)
Or: Where do we stand in Integrated Assessment modelling today?
- four years after the financial crisis
- four years after complete stagnation in international climate policy
![Page 3: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/3.jpg)
Climate policy impacts of the financial crisisbefore afterNov 2008
![Page 4: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/4.jpg)
Climate policy impacts of the financial crisisbefore afterNov 2008
High expectations in UNFCCC 15, Dec 2009 Copenhagen
![Page 5: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/5.jpg)
Climate policy impacts of the financial crisisbefore afterNov 2008
2007, Nobel peace prize, IPCC and Al Gore
High expectations in UNFCCC 15, Dec 2009 Copenhagen
![Page 6: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/6.jpg)
Climate policy impacts of the financial crisisbefore afterNov 2008
2007, Nobel peace prize, IPCC and Al Gore
2007, Stern Report
High expectations in UNFCCC 15, Dec 2009 Copenhagen
![Page 7: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/7.jpg)
Climate policy impacts of the financial crisisbefore afterNov 2008
2007, Nobel peace prize, IPCC and Al Gore
2007, Stern Report
Climate highlighted by all political leaders (e.g. Obama, Merkel,..)
High expectations in UNFCCC 15, Dec 2009 Copenhagen
![Page 8: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/8.jpg)
Climate policy impacts of the financial crisisbefore afterNov 2008
2007, Nobel peace prize, IPCC and Al Gore
2007, Stern Report
Climate highlighted by all political leaders (e.g. Obama, Merkel,..)
UNFCCC 15 failure in Copenhagen
High expectations in UNFCCC 15, Dec 2009 Copenhagen
![Page 9: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/9.jpg)
Climate policy impacts of the financial crisisbefore afterNov 2008
2007, Nobel peace prize, IPCC and Al Gore
2007, Stern Report
Climate highlighted by all political leaders (e.g. Obama, Merkel,..)
UNFCCC 15 failure in Copenhagen
Pre-occupation of policy-makers with financial crisis
High expectations in UNFCCC 15, Dec 2009 Copenhagen
![Page 10: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/10.jpg)
Climate policy impacts of the financial crisisbefore afterNov 2008
2007, Nobel peace prize, IPCC and Al Gore
2007, Stern Report
Climate highlighted by all political leaders (e.g. Obama, Merkel,..)
UNFCCC 15 failure in Copenhagen
Pre-occupation of policy-makers with financial crisis
No clear statements from scientists
High expectations in UNFCCC 15, Dec 2009 Copenhagen
![Page 11: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/11.jpg)
Climate policy impacts of the financial crisisbefore afterNov 2008
2007, Nobel peace prize, IPCC and Al Gore
2007, Stern Report
Climate highlighted by all political leaders (e.g. Obama, Merkel,..)
UNFCCC 15 failure in Copenhagen
Pre-occupation of policy-makers with financial crisis
No clear statements from scientists
Climate becomes a political no-word (cf. Obama-Romney debates)
High expectations in UNFCCC 15, Dec 2009 Copenhagen
![Page 12: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/12.jpg)
In fact, the two problems cannot be separated
climate policy financial crisis
![Page 13: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/13.jpg)
1. The resolution of the recession and sovereign debt problems following the financial crisis requires major new public and private investments
In fact, the two problems cannot be separated
climate policy financial crisis
![Page 14: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/14.jpg)
1. The resolution of the recession and sovereign debt problems following the financial crisis requires major new public and private investments
2. Renewable energy technologies and enhanced energy efficiency provide ideal opportunities for investment
- creating many new jobs
- with wide support in the public
In fact, the two problems cannot be separated
climate policy financial crisis
![Page 15: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/15.jpg)
In fact, the two problems cannot be separated
climate policy financial crisis1. The resolution of the recession and sovereign debt problems following the financial crisis requires major new public and private investments
2. Renewable energy technologies and enhanced energy efficiency provide ideal opportunities for investment
- creating many new jobs
- with wide support in the public
So how did this disconnect between logic and the political process arise?
![Page 16: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/16.jpg)
An explanation:
Climate scientists and economists have lost credibility with policy-makers and the public in their recommendations of the appropriate policy response to climate change
![Page 17: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/17.jpg)
An explanation:
Climate scientists and economists have lost credibility with policy-makers and the public in their recommendations of the appropriate policy response to climate change
because:
1. economists failed to predict the financial crisis, through their belief in the self-rectifying forces of the free market
![Page 18: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/18.jpg)
An explanation:
Climate scientists and economists have lost credibility with policy-makers and the public in their recommendations of the appropriate policy response to climate change
because:
1. economists failed to predict the financial crisis, through their belief in the self-rectifying forces of the free market
2. most integrated-assessment models have similarly been based on the efficient-market paradigm - ignoring the instabilities that led to the financial crisis. So how can they be relevant for solving the financial crisis and initiating a green transformation?
![Page 19: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/19.jpg)
Thus, we need a new generation of integrated assessment models.
Ideas: see set of papers in forthcoming Thematic Issue
“Innovative Approaches to Global Change Modelling”
of Ecological Modelling and Software
With lead article by Carlo Giupponi, Mark Borsuk, Bert de Vries and KH
(based on two workshops of the Global Climate Forum – formally European Climate Forum - in Bekkjarvik, 2009 and Utrecht, 2010)
![Page 20: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/20.jpg)
For impact on stakeholders and climate policy, the models would need to incorporate the following features:
• simple, easily understandable, addressing the current political debate
![Page 21: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/21.jpg)
For impact on stakeholders and climate policy, the models would need to incorporate the following features:
• simple, easily understandable, addressing the current political debate
• realistic representation of the coupling between the real economy and the financial system
![Page 22: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/22.jpg)
For impact on stakeholders and climate policy, the models would need to incorporate the following features:
• simple, easily understandable, addressing the current political debate
• realistic representation of the coupling between the real economy and the financial system
• inclusion of the inherent instabilities of the coupled system
![Page 23: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/23.jpg)
For impact on stakeholders and climate policy, the models would need to incorporate the following features:
• simple, easily understandable, addressing the current political debate
• realistic representation of the coupling between the real economy and the financial system
• inclusion of the inherent instabilities of the coupled system
• representation of the conflicting strategies between different economic actors that give rise to the instabilities – in particular, public-private conflicts
![Page 24: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/24.jpg)
For impact on stakeholders and climate policy, the models would need to incorporate the following features:
• simple, easily understandable, addressing the current political debate
• realistic representation of the coupling between the real economy and the financial system
• inclusion of the inherent instabilities of the coupled system
• representation of the conflicting strategies between different economic actors that give rise to the instabilities – in particular, public-private conflicts
• system-dynamic evolution rather than utility optimization
![Page 25: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/25.jpg)
An example:
MADIAMS: Multi-Actor Dynamic Integrated Assessment Model System
MADIAM: Weber et al, Ecolog, Econ. 2005;MADIAMS: KH and Voinov, in “Reframing the Problem
of Climate Change”, Earthscan, 2011 KH and Kovalevsky, Environ. Mod. Softw, in press, KH, Tellus, submitted
![Page 26: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/26.jpg)
An example:
MADIAMS: Multi-Actor Dynamic Integrated Assessment Model System
MADIAM: Weber et al, Ecolog, Econ. 2005;MADIAMS: KH and Voinov, in “Reframing the Problem
of Climate Change”, Earthscan, 2011 KH and Kovalevsky, Environ. Mod. Softw, in press, KH, Tellus, submitted
MADIAMS: S = system: the model is designed as a hierarchical model family.
![Page 27: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/27.jpg)
An example:
MADIAMS: Multi-Actor Dynamic Integrated Assessment Model System
MADIAM: Weber et al, Ecolog, Econ. 2005;MADIAMS: KH and Voinov, in “Reframing the Problem
of Climate Change”, Earthscan, 2011 KH and Kovalevsky, Environ. Mod. Softw, in press, KH, Tellus, submitted
MADIAMS: S = system: the model is designed as a hierarchical model family.
Here, a simple version: 7 actors; real-economy sector:3 state variables; financial sector: 11 state variables
![Page 28: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/28.jpg)
Simple version: real economy, state variables
r capital associated with renewable energy technology
k capital associated with conventional energy technology
g consumer goods and services
![Page 29: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/29.jpg)
Simple version: real economy, state variables
r capital associated with renewable energy technology
k capital associated with conventional energy technology
g consumer goods and services
Total production
y = yr + yk + yg with y = y(r,k)
![Page 30: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/30.jpg)
Simple version, real economy, state variables
r capital associated with renewable energy technology
k capital associated with conventional energy technology
g consumer goods and services
Total production
y = yr + yk + yg with y = y(r,k)
Growth path - determined by distribution yr = r y,
yk = k y,
yg = g y
of y ( = GDP) between three production streams, with distribution factors r, k, g governed by actor strategies
![Page 31: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/31.jpg)
flows: production flows: depreciation and consumption
stocks: capital and consumer goods
total production
![Page 32: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/32.jpg)
Examples of two real-economy growth paths: BAU and GREEN (green transformation)
GREENBAU
r = 0
g
k
![Page 33: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/33.jpg)
BAU
GREEN
Conclusion: green policy incurs negligible long-term loss in GDP
![Page 34: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/34.jpg)
BAU
BAU
GREEN
GREENwelfare = y q exp(- 0.1 T2)
employment level
GDP
global warming
global warming
- but has major impact on global warming and welfare
![Page 35: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/35.jpg)
Results are consistent with many previous more detailed investigations (e.g.Stern report).
![Page 36: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/36.jpg)
Results are consistent with many previous more detailed investigations (e.g.Stern report).
But note: no cost-benefit analysis, no discounting of future against present, just common sense, first-order inference of assumed investment decisions. Value judgements (e.g. welfare) clearly stated.
![Page 37: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/37.jpg)
Interaction with the financial sector: A given real-economy growth curve can correspond to many different wealth curves of individual actors in the financial sector
Results are consistent with many previous more detailed investigations (e.g. Stern report).
But note: no cost-benefit analysis, no discounting of future against present, just common sense, first-order inference of assumed investment decisions. Value judgements (e.g. welfare) clearly stated.
![Page 38: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/38.jpg)
Financial sector
Actors:
household (workers, consumers)r-firm (renewable-energy based)k-firm (conventional-energy based)r-investor (renewable-energy based)k-investor (conventional-energy based)governmentcentral bank
State variables:
liquidity for all actors, plus assets for investors
![Page 39: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/39.jpg)
The financial sector: a highly simplified projection of reality, but already with 11 state variables and innumerable flows and interaction parameters. The concept of “rational perfectly informed economic actors” operating in an inherently stable system is clearly unrealistic
![Page 40: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/40.jpg)
Two possible evolution paths of the financial sector for the real-economy growth path R-BAU: (1) BAL (all budgets balanced) and (2) DEF deficit government budget. Welfare is enhanced, but the government debt is sustainable only as long as creditors don’t balk.
BAL
BAL
BAL
BAL
DEF
DEF
DEF
DEF
![Page 41: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/41.jpg)
How is it possible to have to two (or many more) alternative evolution paths of the financial sector for the same real-economy growth path?
Should economic systems not always adjust to a unique equilibrium according to basic economics?
![Page 42: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/42.jpg)
Textbook view of equilibrium established between supply, demand and price (e.g. Samuelson and Nordhaus, Abel and Bernanke)
![Page 43: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/43.jpg)
System dynamics representation of supply-demand-price interdependence dS/dt = F (S,D,P) (S = supply)
dD/dt = G (S,D,P) (D = demand)
dP/dt = H (S,D,P) (P = price)
![Page 44: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/44.jpg)
dS/dt = F (S,D,P) (S = supply)
dD/dt = G (S,D,P) (D = demand)
dP/dt = H (S,D,P) (P = price)
General result: A Lorenz-type system of three 1st -order differential equations can have many solutions:
• a damped periodic or monotonic transition to an equilibrium point
• a stable convergence to a periodic attractor
• an unstable trajectory diverging to infinity
• a bounded, non-periodic chaotic trajectory
System dynamics representation of supply-demand-price interdependence
![Page 45: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/45.jpg)
dS/dt = F (S,D,P) (S = supply)
dD/dt = G (S,D,P) (D = demand)
dP/dt = H (S,D,P) (P = price)
General result: A Lorenz-type system of three 1st -order differential equations can have many solutions:
• a damped periodic or monotonic transition to an equilibrium point
• a stable convergence to a periodic attractor
• an unstable trajectory diverging to infinity
• a bounded, non-periodic chaotic trajectory
Which type of solution is realized depends on the initial conditions and the behaviour of the economic actors
System dynamics representation of supply-demand-price interdependence
![Page 46: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/46.jpg)
Example 1: Stable actor behavior assumed in the standard supply-demand diagram, yielding equilibrium in supply, demand & price.
Demand Price Demand = stabilizing feedback loop
![Page 47: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/47.jpg)
Example 2: low-confidence consumer-producer behavior leading to business cycles (see mental models of many classical economists).
Demand Supply Demand = destabilizing feedback
![Page 48: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/48.jpg)
Example 3: Speculative demand and supply behavior in asset markets, leading to a boom-and-bust limit cycle (e.g. the dot.com bubble) Price Demand Price = destabilizing feedback
![Page 49: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/49.jpg)
Other examples of non-equilibrium financial imbalances:
Over-exposed banking sector through enhanced risk taking of investors stimulated by innovative financial products such CDSs (credit default swaps) and CDOs (Colaterized Debt Obligations)
![Page 50: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/50.jpg)
Other examples of non-equilibrium financial imbalances:
Over-exposed banking sector through enhanced risk taking of investors stimulated by innovative financial products such CDSs (credit default swaps) and CDOs (Colaterized Debt Obligations)
(claimed by proponents to distribute risk, but actually enhances overall risk by encouraging investors to take risks they would otherwise not have taken)
![Page 51: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/51.jpg)
Other examples of non-equilibrium financial imbalances:
Over-exposed banking sector through enhanced risk taking of investors stimulated by innovative financial products such CDSs (credit default swaps) and CDOs (Colaterized Debt Obligations)
(claimed by proponents to distribute risk, but actually enhances overall risk by encouraging investors to take risks they would otherwise not have taken)
Persistent sovereign debt – as in the example shown (e.g. Euro crisis)
![Page 52: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/52.jpg)
Government policies that prevent these instabilities is a pre-condition for creating the confidence in the economy needed to encourage long-term investments in the green transformation.
Thus:
financial stabilization green transformation
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Government policies that prevent these instabilities is a pre-condition for creating the confidence in the economy needed to encourage long-term investments in the green transformation.
Thus:
financial stabilization green transformation
but also
green transformation financial stabilization
![Page 54: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/54.jpg)
Government policies that prevent these instabilities is a pre-condition for creating the confidence in the economy needed to encourage long-term investments in the green transformation.
Thus:
financial stabilization green transformation
but also
green transformation financial stabilization
Applied to our example: sovereign debt
![Page 55: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/55.jpg)
DEF
DEF
DEF
BAL
BAL
BAL
BAL
SAVSAV
SAV,SAV
REC
REC
REC
REC
REC
employment
Alternative assumptions on impacts of a savings strategy to re-adjust the DEF trajectory to the BAL trajectory:
SAV: assumes self-stabilizing forces of the free market
REC: predicts a major recession and unemployment through unstable feedbacks
REC
![Page 56: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/56.jpg)
The data for Southern Europe clearly favours the recession model over the stable-market-response model.
Alternative to austerity model:
Keynes - combine savings (if at all) with government sponsored investments in the real economy – for example, in green technologies.
![Page 57: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/57.jpg)
Comparison of the pure savings, recession creating, strategy REC with a combined savings plus Keynes-type enhanced green investment strategy GR-INV. Also shown: the reference non-feedback green strategy GREEN
![Page 58: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/58.jpg)
Conclusions:
• None of these examples are new, but in contrast to many integrated assessment models in the literature, they reflect the current political debate
![Page 59: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/59.jpg)
Conclusions:
• None of these examples are new, but in contrast to many integrated assessment models in the literature, they reflect the current political debate
• The models are very simple, easy to understand and communicate, and can be constructed in a few days
![Page 60: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/60.jpg)
Conclusions:
• None of these examples are new, but in contrast to many integrated assessment models in the literature, they reflect the current political debate
• The models are very simple, easy to understand and communicate, and can be constructed in a few days
• In contrast to their simplicity, they often reveal unexpected dynamics through their stocks-and-flows time separation of input and response
![Page 61: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/61.jpg)
Conclusions:
• None of these examples are new, but in contrast to many integrated assessment models in the literature, they reflect the current political debate
• The models are very simple, easy to understand and communicate, and can be constructed in a few days
• In contrast to their simplicity, they often reveal unexpected dynamics through their stocks-and-flows time separation of input and response
• The models should be constructed interactively with stakeholder and policy-makers in a participatory mode
![Page 62: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/62.jpg)
Conclusions:
• None of these examples are new, but in contrast to many integrated assessment models in the literature, they reflect the current political debate
• The models are very simple, easy to understand and communicate, and can be constructed in a few days
• In contrast to their simplicity, they often reveal unexpected dynamics through their stocks-and-flows time separation of input and response
• The models should be constructed interactively with stakeholder and policy-makers in a participatory mode
• The models need to be calibrated against data. The examples given here were calibrated only against mean growth “stylized facts”. Interaction parameters were guessed
![Page 63: Climate Change and the Financial Crisis Klaus Hasselmann Max Planck Institut for Meteorology, Hamburg, and Global Climate Forum Workshop on Coupled Climate-Economics.](https://reader030.fdocuments.in/reader030/viewer/2022032806/56649efd5503460f94c10977/html5/thumbnails/63.jpg)
Thanks for listening
Discussion welcome