xi = amount of time individual i displays
k = rate at which costs are expended
V = value of resource
Payoff to: Player A Player B
Actor : xA > xB
Opponent: xA < xB
V - kxB - kxB
- kxA V - kxA
No pure ESS is possible, since an opponent that displayed a little
bit longer would have higher fitness
Solution is a mixed ESS where the probability of leaving at any
time is a constant. The times an individual stays should be
distributed as a negative exponential.
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