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System Zoo Z409 Fishery dynamics from Hartmut Bossel (2007) System Zoo 2 Simulation Models. Climate, Ecosystems, Resources

Fishing is a classic example for use of a renewable resource. Unless overfished, fish populations If is hardly by fishing, then the fish population will persist at a constant size corresponding to its specific ecological envi ronment If the stock is overfished, the juvenile generation becomes too small to fully replace the adult generation. If overfishing continues. the population cannot recover and will collapse in short time. Even if fish catch stops now/, it could take decades until the fish population recovers to its original size if it hasn't become extinct meanwhile. In many of the world overtlshing has led, and still leads, to the complete collapse of formerly huge tlsh populations: herring in the North Sea, codtlsh in the Northern Atlantic. tuna, whales to name only a few. With the collapse of fish stocks came the collapse of the t1shing industry in many regions. Employment and

incomes disappeared: whole regions (like Newfoundland) lost their economic base.

REM 221 - Z409 Fishery dynamics

Steve Conrad

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On the occasion of th G20-meeting in Toronto, the German Economics minister Herr Schaüble said that without restoring confidence it would not be possible to get consumer spending and business investment going. Similar remarks were made by David Cameron and Señor Zapatero of Spain. All maintain that confidence is a pre-requisite to get growth going and that, therefore, it was imperative to reduce fiscal deficits. Reducing the fiscal deficit will restore confidence at first. However, reducing the deficit very quickly will introduce a dynamic that may cause the economy to decline - and perhaps depress consumers demand even further. It will actually destroy confidence: few businesses are inclined to invest in a shrinking economy. Cutting the deficit too rapidly or too steeply can lead to a confidence trap.

NOTE: A big experiment is now taking place in the UK - the government has cut public spending severely! Will this lead to hardship and, perhaps, social unrest?

Confidence Trap and Growth

Hanns-Jürgen Hodann

this model shows the relationship between economic growth and government debt (just the bailout debt) and the mortgage default burden. At the current rates, the debt will never be paid off.

bailout debt, mortgage defaults and economic growth

James Fitzsimons

Base_economics

Andrey Kuzmischev

Health Determinants

Chelsea Poeppel

This page provides a structural analysis of POTUS Candidate Mike Huckabee's economic policy based on the information at: http://www.mikehuckabee.com/tax-reform and http://www.mikehuckabee.com/spending-debt (here, the candidate did not have a single clear economic policy, so we used economic elements from other policy statements that were clearly relevant). The method used is Integrative Propositional Analysis (IPA) available: http://scipolicy.org/uploads/3/4/6/9/3469675/wallis_white_paper_-_the_ipa_answer_2014.12.11.pdf

DRAFT IPA of Mike Huckabee Economic Policy

Steve Wallis

Economic Model - Final Project

Christy Maynard

Financial Economics Model - Explorer Lab V1

Chris Fortuin

Simple model of the global economy, the global carbon cycle, and planetary energy balance.

The planetary energy balance model is a two-box model, with shallow and deep ocean heat reservoirs. The carbon cycle model is a 4-box model, with the atmosphere, shallow ocean, deep ocean, and terrestrial carbon.

The economic model is based on the Kaya identity, which decomposes CO2 emissions into population, GDP/capita, energy intensity of GDP, and carbon intensity of energy. It allows for temperature-related climate damages to both GDP and the growth rate of GDP.

This model was originally created by Bob Kopp (Rutgers University) in support of the SESYNC Climate Learning Project.

Clone of Simple Climate-Carbon-Economic Model

Ana Belén Ríos CArmona

Migration

Luca Pavan

This page provides a structural analysis of POTUS Candidate Jim Gilmore's economic policy based on the information at: http://www.gilmoreforamerica.com/jims-growth-code/ The method used is Integrative Propositional Analysis (IPA) available: http://scipolicy.org/uploads/3/4/6/9/3469675/wallis_white_paper_-_the_ipa_answer_2014.12.11.pdf

DRAFT IPA of Jim Gilmore Economic Policy

Steve Wallis

The macroeconomic ruel: SPENDING = INCOME = OUTPUT, WHICH DRIVES EMPLOYMENT is presented here in a schematic form. Output can be taken to be equivalent to GDP. In order to maintain output it is necessary for all the income earned to be spent. If this is not the case, then companies find they have excess unsold stock on their hands and will cut back on production. This, in time, will lead to an increase in unemployment as companies need fewer employees. The shortfall in spending can be made up by any of the three sectors that contribute to total output. However, in cases where a country has a trade deficit and where the private sector is not spending or investing enough, the only option is for the government to Net Spend i.e. to spend more than it collected in taxes causing a fiscal deficit.

Investment and Output 1

Hanns-Jürgen Hodann

Brainstorming - Scoping constraints of tradeoff microanalysis

Laura Anne Geronimo

Simulating Hyperinflation for 3650 days.

If private bond holdings are going down and the government is running a big deficit then the central bank has to monetize bonds equal to the deficit plus the decrease in private bond holdings. We don't show the details of the central bank buying bonds here, just the net results.

See blog at http://howfiatdies.blogspot.com for more on hyperinflation, including a hyperinflation FAQ.

Hyperinflation Simulation

Vincent Cate

14

Fig 4. The Casual Loop Diagram of the Socio-Political and Economic Subsystems

Rony Zhu

Verano, Mary Ann (Economic Data)

Verano, Mary Ann U.

Lakon_Energy Economics Fossil Fuel

Nick Lakon

Socio-economic Cycle - Final Porjecy

Jeremy Tardioli

Storytelling of My Investigating Insight Theme

Ana Cristina Beja

This paper aims at describing a case where system dynamics modeling was used to evaluate the effects of information and material supply lead-time variation on sales contributions margins and operating cash conversion cycle of a commodity export business. An empirical dynamic model, loaded with econometric theory of price effect on competitive demand, was used to describe the input data. The model simulation outputs proved themselves relevant in analyzing the complex interconnections of multiple variables affecting the profitability in a commercial routine, supporting the decision process among sales managers.

Article SDR Case study System dynamic modelling

Marcos Fraiha

3

Template to start Assignment 1. Includes a solution to Worksheet 4.

MV ISCI 360 Assignment 1 (1)

Maria Vas

A system diagram for the Mojave Desert including example socio-economic factors for an assignment at OSU- RNG 341.

Mojave Desert System Diagram with SES

Abi Wells

An initial study of the economics of single use coffee pods.

TENESPRESSO

Tenay Malachi

The model is unrealistic since it has no measurable values but help in visualizing the complexity of the relationship between ecology and socio-economic. The simulation model has a variety of factors that need to be considered, and the factors emulate hypothetical actions that game park managers need to consider so as to include the complexity of biodiversity in the decision-making process

A model of the complex relationship between variables

Shoeb Hussain