NetLogo Models Library:
Sample Models/System Dynamics

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Exponential Growth

Run Exponential Growth in your browser uses NetLogo 5.0.4 requires Java 5 or higher (system requirements) Note: If you download the NetLogo application, every model in the Models Library (besides the Community Models) is included. If you have trouble running this model in your browser, you may wish to download the application instead.

## WHAT IS IT?

This is a model of exponential growth using the System Dynamics Modeler.

## HOW IT WORKS

At each step, the value of INFLOW is added to STOCK. The value of INFLOW is always the previous value of STOCK times a specified growth rate.

## HOW TO USE IT

Press the SETUP button, then press the GO button to run the model.

## THINGS TO NOTICE

View the STOCK monitor to see the current value of STOCK.

View the plot to observe the growth of STOCK over time.

## THINGS TO TRY

Use the System Dynamics Modeler to add an outflow.

Try different growth-rate values.

## EXTENDING THE MODEL

Create a new stock that grows linearly. Try having the level of one stock influence the growth rate of the other.

## NETLOGO FEATURES

This model uses the System Dynamics Modeler.

## RELATED MODELS

System Dynamics -> Logistic Growth

## HOW TO CITE

If you mention this model in a publication, we ask that you include these citations for the model itself and for the NetLogo software:

* Wilensky, U. (2005). NetLogo Exponential Growth model. http://ccl.northwestern.edu/netlogo/models/ExponentialGrowth. Center for Connected Learning and Computer-Based Modeling, Northwestern Institute on Complex Systems, Northwestern University, Evanston, IL.
* Wilensky, U. (1999). NetLogo. http://ccl.northwestern.edu/netlogo/. Center for Connected Learning and Computer-Based Modeling, Northwestern Institute on Complex Systems, Northwestern University, Evanston, IL.

## COPYRIGHT AND LICENSE

Copyright 2005 Uri Wilensky.


This work is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License. To view a copy of this license, visit http://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to Creative Commons, 559 Nathan Abbott Way, Stanford, California 94305, USA.

Commercial licenses are also available. To inquire about commercial licenses, please contact Uri Wilensky at uri@northwestern.edu.

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