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Trade

by Romulus-Catalin Damaceanu (Submitted: 03/23/2010)

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WHAT IS IT?

This model describes a economy using three types of resources: water, food and energy. Inside this economy, there is an artificial society with the following characteristics:
(i) the turtles are of two types: female and male;
(ii) these turtles have a limited life expectancy determined by the parameters LifeExpectancyMax (maximum life expectancy) and LifeExpectancyMin (minimum life expectancy);
(iii) the patches Pxy are of three types: type 1 that stores a certain amount of water, type 2 that stores a certain amount of food and type 3 that stores a certain amount of energy.
(iv) a male and female turtle can create a couple and a number of children;
(v) the children can inherit the wealth of their parents;
(vi) the basic needs of every turtle are 1 unit of water, 1 unit of food and 1 unit of energy per one year;
(vii) if these basic needs are not fulfilled then the respective turtle dies;
(viii) if a turtle has an amount of wealth in water, food, and energy that exceeds a certain limit determined by the parameter TurtleMinWealthToBuy then it starts to buy resources from the other turtles that have an amount of resources that exceeds the value of the parameter TurtleMinWealthToSell.

HOW IT WORKS

The model has two buttons:
- <Setup> - that declare and setup parameters, initial variables, agents and patches
- <Go> - Start the simulation and stop the simulation when 1000 years passed or there are no agents
You can set the next sliders:
- rs - that set the value of the random seed: -2, -1, 0, 1, 2;
- Interval - that set the value of resources growth interval: 1, 2, ..., 10;
and the next switchers:
- Renewable = {on, off} - has two possible values: off for nonrenewable resources and on for renewable resources;
- Trade = {on, off} - has two possible values: off when trade is not allowed between agents and on when trade is allowed.
In the interface tab, there are the next monitors:
- Low - the number of turtles from low class;
- Medium - the number of turtles from medium class;
- High - the number of turtles from high class;
- AvgVisionLow - the average vision for low class;
- AvgVisionMedium - the average vision for medium class;
- AvgVisionHigh - the average vision for high class;
- WealthLow - mean wealth in water;
- WealthMedium - mean wealth in food;
- WealthHigh - mean wealth in energy;
- TradeLow - the amount of traded resources by low class;
- TradeMedium - the amount of traded resources by medium class;
- TradeHigh - the amount of traded resources by high class;
- PurchaseLow - the amount of purchased resources by low class;
- PurchaseMedium - the amount of purchased resources by medium class;
- PurchaseHigh - the amount of purchased resources by high class;
- SoldLow - the amount of sold resources by low class;
- SoldMedium - the amount of sold resources by medium class;
- SoldHigh - the amount of sold resources by high class;
- MeanWealthWater - mean wealth in water;
- MeanWealthFood - mean wealth in food;
- MeanWealthEnergy - mean wealth in energy;
- AbsoluteGlobalWealth - the absolute value of global wealth (the cumulated value of water, food and energy resources);
- Year - the number of years
- NoTurtles - the number of turtles
- Women - the number of females;
- Men - the number of males;
- MeanGlobalWealth - mean global wealth;
- MeanGlobalTrade - mean global trade.

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