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Copy of Endogenous Group Formation experiment
Transcript of Copy of Endogenous Group Formation experiment
history influence individual behaviour?
How does childhood
responses to social interactions?
explanations could apply?
group level processes
interact to affect selection at a
from individual to
within group cooperation
How rational agents perform
How humans performed
in the third experiment
More incentive for selfishness
Group strength in competition
Bigger groups generate more public goods
Individual returns from group competition
Individuals get less spoils in bigger groups
But group competition may keep cooperation in check
critical group sizes
at which cooperation breaks down or groups collapse
Selection for smaller groups
Selection for larger groups
Selfish individuals limit their expected fitness by
in isolated groups
common even when it can be
to individuals and groups
groups have selective
over non-cooperative groups
is an individual trait that is selected for due to
Cooperation and conflict are the keys
organisation and complexity in biology
Dependence on group performance
Individual fitness =
Fitness from within-group competition
Fitness from between-group competition
Individual fitness =
: individual action that improves the fitness of another
There is no
at a higher organisational level
in group competition and
spontaneously in randomly formed groups and
a stable level of cooperation
affect the relationship between
Complex population structures
can be determined by
individual level decisions
At the individual level we have...
behaviour can evolve...
... which influence whether or not...
... behaviours that
... which then affects the payoffs of...
1. The size of group that they want to join
2. How much to invest in the public good
3. Vote on how to interact with other groups