6.2.2 Defining triggers
In rapid-onset crises defining the trigger is more
straightforward than a slow-onset crisis, where the
trigger may be a combination of rainfall forecasts and
other weather-related indicators, as well as changes
in prices of food and other commodities, politics, etc.
How the trigger is defined will affect how accurate the
forecast is, the likelihood of acting in vain and therefore
the overall cost-effectiveness of the response. Crises often
arise as a result of the interplay of changes in rainfall,
vegetation and prices, as well as other factors. As a result,
the cost-effectiveness of a response can be fundamentally
affected by the composition of indicators used to trigger
it, and these will vary according to the context and types
of livelihoods affected by the disaster.
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