It might be easier with more degrees of
freedom.
You could add some competing
processes, and let the pickers evolve the best strategy(ies) for integrating
them. A random subset of the lots could have radio transmitters
that broadcast their coordinates and their grape quantities. A random
subset of the pickers could have radio receivers that pick up this
information. Based on their current location, they could choose (perhaps
probabilistically) some weighted combination of moving to the neighbor lot
with the most grapes, or toward a nearby, but not neighboring lot announcing it
has a lot of grapes. The weighting of the two strategies could depend upon
the difference between the maximum number of grapes available in the choices, or
more complicated information about grapes available in a larger
neighborhood. In some cases, there would be a choice between
stopping to pick in the current lot or just passing through it quidkly to get to
a richer one.
You could allow pickers to share their grapes
with other pickers, possibly increasing the common pool by
cooperating.
Rich pickers might have to put down some of their
grapes in order to pick more. Others could evolve a strategy of following
those pickers to steal these piles, and the rich pickers could evolve weapons to
defend their grapes from a distance, and police, paid in grapes, to protect
grapes gathered by the sweat of the brow. Rich pickeers could loan grapes
to poorer ones with interest (in grapes, of course) accruing.
Etc.
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