the **go once** button will run a single period. Some lands will be sold to new owners. A directed link points from the original owners to the new owner. The color of the land will change to that of the new owner.
The land distribution is shown in the **land distribution** histogram and the **landless** plot.
As the model runs, there are more and more links. But at the Jubilee year, some or all lands return to their original owner, so some or all links are removed.
The number of deals canceled is shown in the **deals canceled** plot.
## THINGS TO NOTICE
When the Jubilee procedure is **jubilee-to-landless** or **jubilee-from-landowners**, the number of landless citizens decreases in each Jubilee, relative to the previous Jubilee. Over time, all citizens will have land. The land distribution approaches the state where all citizens have land (as long as the number of lands is not less than the number of citizens).
To see this more clearly, set the periods-per-jubilee to 1.
This apparently does not happen for **no-jubilee** or **jubilee-for-all**.
When the Jubilee procedure is **jubilee-to-landless-from-landowners**, the number of landless citizens initially decreases, but then stops decreasing and begins fluctuating. This procedure does NOT guarantee that the number of landless will not increase!
## THINGS TO TRY
How many Jubilees it takes until each citizen has a land?
How does the answer depends on the probability-of-deal?
How does the answer depends on the num-of-lands?
Try setting **periods-per-jubilee** to 1 and **probability-of-deal** to 1.0, and see how the number of landless decreases.
How does the number of deals canceled change, as more and more citizens have land?
If originally ALL citizens have land, is it still possible that some deals will NOT be canceled in the Jubilee year? What is required for this to happen? (hint: look for cycles in the graph at period 0).
## EXTENDING THE MODEL
Right now the probability of any land being sold is identical. Can you think of more realistic models?
Perhaps the model should also include wealth; wealthy citizens are more likely to buy lands, while poor citizens are more likely to sell lands.
Perhaps the model should also include subjective prerefences: some citizens prefer to live in the east, while others prefer to live in the west. etc.
## NETLOGO FEATURES
Citizens are turtles. Land-plots are patches. However, since there are usually more patches then turtles, only some of the patches are considered for the model. They are called 'land-patches' in the code, and are colored in the same color as their current owner.
Links are used to link the original owner of a land with its current owner. A cycle, in that graph, means that the relevant owners switched their lands.
## 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:
## COPYRIGHT AND LICENSE
Copyright 2012 Erel Segal the Levite.
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