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A population derives some benefit from living in a certain environment. However, in this environment, flooding can occur and cause damage. An individual protection measure can be adopted by those who wish and have the means to do so. This measure has a cost but reduces the damage in case of flood. However, the effectiveness of this measure deteriorates over time. Individual motivation to adopt this measure is boosted by the occurrence of a flood and information exchange in the individual's social network. Different sequences of floods can occur (at different points in time and with different strengths). The public authorities can encourage the population to adopt the measure in carrying out information campaigns, which of course has a cost.
The proposed efficiency indicator determines the net sum of individual wealth created, after deduction of the costs of information campaigns. One can also consider an indicator of the sum of individual wealth created, without considering the costs.