| Ø | Click on the Setup a Simulation button. |
| Ø | Click on time to form expectations, type in the value 0.5 and press Enter. |
| Ø | Click on the Simulate button and answer Yes to the query about overwriting. |
You should be informed of an error occurring while computing effect price demand at time 44.
| Ø | Click on effect price demand and click on the Causes Strip. |
The values jump around a lot, but the source of the error is the negative value that price takes on at the end.
| Ø | Trace the causes of the behavior using the Causes strip through the sequence effect price demand, price, change in price, target price, and then expected demand. |
expected demand goes negative, even through demand is always positive. This happens because we set the time constant for changing expected demand to a value smaller than TIME STEP.
Odd behavior such as that displayed here often results because of a problem like this. If you see this type of oscillation and can not find the problem try changing TIME STEP to a smaller number. If this makes a big difference in behavior you probably have a time constant somewhere that is too short. Note that such time constants might not be explicitly defined in the way expected demand is.
