Regulation of resource allocation to production in response to inventory adequacy and delivery delay. A non-price-mediated resource allocation system. From Sterman JD Business Dynamics p172 Fig 5-27

Regulation of resource allocation to production in response to inventory adequacy and delivery delay. A non-price-mediated resource allocation system. From Sterman JD Business Dynamics p172 Fig 5-27

This model shows the operation of a simple economy. It demonstrates the effect of changes in the fractional rate of consumption (or the converse, the fractional rate of saving.) It also, unlike Models 2 & 3, shows the influence Savings has on the  production rate .  In summary, lower rates of co
This model shows the operation of a simple economy. It demonstrates the effect of changes in the fractional rate of consumption (or the converse, the fractional rate of saving.) It also, unlike Models 2 & 3, shows the influence Savings has on the production rate.

In summary, lower rates of consumption (based on production) result in higher rates of both production and consumption in the long-run.
 The World3 model is a detailed simulation of human population growth from 1900 into the future. It includes many environmental and demographic factors. 
 Use the sliders to experiment with the initial amount of non-renewable resources to see how these affect the simulation. Does increasing the amou

The World3 model is a detailed simulation of human population growth from 1900 into the future. It includes many environmental and demographic factors.

Use the sliders to experiment with the initial amount of non-renewable resources to see how these affect the simulation. Does increasing the amount of non-renewable resources (which could occur through the development of better exploration technologies) improve our future? Also, experiment with the start date of a more environmentally focused policy.

10 11 months ago
In this Insight I focus on the demand site of the Market and Price model, leaving the supply side out.
In this Insight I focus on the demand site of the Market and Price model, leaving the supply side out.
A sample model for class discussion modeling COVID-19 outbreaks and responses from government with the effect on the local economy.  Govt policy is dependent on reported COVID-19 cases, which in turn depend on testing rates less those who recover       Assumptions   Govt policy reduces infection and
A sample model for class discussion modeling COVID-19 outbreaks and responses from government with the effect on the local economy.  Govt policy is dependent on reported COVID-19 cases, which in turn depend on testing rates less those who recover

Assumptions
Govt policy reduces infection and economic growth in the same way.

Govt policy is trigger when reported COVID-19 case are 10 or less.

A greater number of COVID-19 cases has a negative effect on the economy.  This is due to economic signalling that all is not well.

Interesting insights

Higher testing rates seem to trigger more rapid government intervention, which reduces infectious cases.  The impact on the economy though of higher detected cases though is negative. 




This is an important Henry George insight; labor creates all wealth (rather than capital creating it). This model attempts to illustrate (crudely) how capital responds to price discovery.   Among many things it will be necessary to show how money is created and the link between money and capital. (1
This is an important Henry George insight; labor creates all wealth (rather than capital creating it).
This model attempts to illustrate (crudely) how capital responds to price discovery. 
Among many things it will be necessary to show how money is created and the link between money and capital. (10/11/2014) 
To Do
find out how to draw appropriate flows; reinforcing and balancing loops etc
 The purpose of this model intends to supply a way to organize and apply support for the human rights of all people.    March Status of Women Report   The United Nations status on Women one of the highest authorities internationally describes the violence against women priorities to include the foll

The purpose of this model intends to supply a way to organize and apply support for the human rights of all people.  

March Status of Women Report 
The United Nations status on Women one of the highest authorities internationally describes the violence against women priorities to include the following as a 2nd part of the report.  

The Working Group's second thematic report to the Human Rights Council in June 2014 will be on women's economic and social life. 

Violence against women as a cross-cutting issue will involve consideration, amongst other things, of violence and sexual harassment in the workplace, in the professions, in educational institutions, in prostitution, or with regard to land or inheritance rights. 

The Working Group will address women's right to equality in public and private, governmental and international institutional frameworks.

It will examine the way against women impacts their capacities in the economic and social spheres and deprives them of equal opportunities. 

The Working Group notes that this is mentioned in the Draft Agreed Conclusions and kindly requests that it be expanded violence emphasized.

Our third thematic theme is family and culture and this will of course include examination of the ways to eliminate discrimination and violence against women and girls in the family, which is often condoned by patriarchal cultural stereotypes. This lies at the core of violence against women, as pointed out in the Draft Agreed Conclusions. Violence against women and girls in the family violates their health and safety and creates a primary barrier to their well-being and equality in all the spheres of their lives.
Indeed private violence is also political, creating an environment of fear in which women live out their lives and constituting an instrument of patriarchal control over women.

In conclusion, relating to violence as a crosscutting issue means both separate and integrated understanding of the impact of violence against women in all spheres of their lives

We see discrimination and violence against women as interconnected phenomena, stemming from the same epistemological, and mutually reinforcing. The Working Group notes in full agreement with the emphasis in the Draft Agreed Conclusions that the ending of violence against women and girls is not an option but must be a priority for the achievement of sustainable development, peace and security, human rights, economic growth and social cohesion and that the elimination of violence against women and girls must be reflected as a priority area in the post-2015 development framework


This is a toy model of tax policies.    The findings were presented at the 6th International Dijon Conference (2012) in a paper called 'Extended Circuit Theory: Modelling the Impact of Government Interventions'.
This is a toy model of tax policies.

The findings were presented at the 6th International Dijon Conference (2012) in a paper called 'Extended Circuit Theory: Modelling the Impact of Government Interventions'.
This is to support a discussion on money flows and growth. Money as a lubricant for the flow of embodied energy in human systems. See also A Prosperous Way Down  website
This is to support a discussion on money flows and growth. Money as a lubricant for the flow of embodied energy in human systems.
See also A Prosperous Way Down website
 This Model was developed from the SEIR model (Susceptible, Enposed, Infected, Recovered). It was designed to explore relationships between the government policies regarding the COVID-19 and its impact upon the economy as well as well-being of residents.    Assumptions:   Government policies will be

This Model was developed from the SEIR model (Susceptible, Enposed, Infected, Recovered). It was designed to explore relationships between the government policies regarding the COVID-19 and its impact upon the economy as well as well-being of residents. 

Assumptions:

Government policies will be triggered when reported COVID-19 case are 10 or less;


Government Policies affect the economy and the COV-19 infection negatively at the same time;


Government Policies can be divided as 4 categories, which are Social Distancing, Business Restrictions, Lock Down, Travel Ban, and Hygiene Level, and they represented strength of different aspects;

 

Parameters:

Policies like Social Distancing, Business Restrictions, Lock Down, Travel Ban all have different weights and caps, and they add up to 1 in total;

 

There are 4 cases on March 9th; 

Ro= 5.7  Ro is the reproduction number, here it means one person with COVID-19 can potentially transmit the coronavirus to 5 to 6 people;


Interesting Insights:

Economy will grow at the beginning few weeks then becoming stagnant for a very long time;

Exposed people are significant, which requires early policies intervention such as social distancing.

  A system dynamics model to CBA of smart grid project
A system dynamics model to CBA of smart grid project
11 9 months ago
Stephen P Dunn 2010 Book summary including Technostructure MMT PCT critical realist and managing perceptions links
Stephen P Dunn 2010 Book summary including Technostructure MMT PCT critical realist and managing perceptions links
WIP replication of Khalid Saeed's draft paper presented by the Economics chapter of the SD Society in Sept 2019  youtube video
WIP replication of Khalid Saeed's draft paper presented by the Economics chapter of the SD Society in Sept 2019 youtube video
Eastern oyster growth model calibrated for Long Island Sound Developed and implemented by Joao G. Ferreira and Camille Saurel; growth data from Eva Galimany, Gary Wickfors, and Julie Rose; driver data from Julie Rose and Suzanne Bricker; Culture practice from the REServ team and Tessa Getchis. This
Eastern oyster growth model calibrated for Long Island Sound
Developed and implemented by Joao G. Ferreira and Camille Saurel; growth data from Eva Galimany, Gary Wickfors, and Julie Rose; driver data from Julie Rose and Suzanne Bricker; Culture practice from the REServ team and Tessa Getchis. This model is a workbench for combining ecological and economic components for REServ. Economic component added by Trina Wellman.

This is a one box model for an idealized farm with one million oysters seeded (one hectare @ a stocking density of 100 oysters per square meter)

1. Run WinShell individual growth model for one year with Long Island Sound growth drivers;

2. Determine the scope for growth (in dry tissue weight per day) for oysters centered on the five weight classes)
 
3. Apply a classic population dynamics equation:

dn(s,t)/dt = -d[n(s,t)g(s,t)]/ds - u(s)n(s,t)

s: Weight (g)
t: Time
n: Number of individuals of weight s
g: Scope for growth (g day-1)
u: Mortality rate (day-1)

4. Set mortality at 30% per year, slider allows scenarios from 30% to 80% per year

5. Determine harvestable biomass, i.e. weight class 5, 40-50 g (roughly three inches length)
A simple budget planning system.  What additional complexities can you add?
A simple budget planning system.  What additional complexities can you add?