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Intervention costs*: direct costs of employees and materials and buildings:
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- Wages of employees and the amount of time spent on the intervention
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- Materials (re-usable/non re-usable, e.g. buildings, transport, didactic material) and attributable costs (distinguishing between fixed and variable costs)?
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Direct treatment costs*: direct medical costs for treatment of symptomatic (physical and psychical) health problems related to different levels of use.
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Indirect productivity costs: impact of the different levels of drug use on
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- Absenteeism as a consequence of morbidity
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- Decreasing personal development and level of productivity
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- Unemployment
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Indirect 'control' costs
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- repressive and (secondary) preventive means to deal with social trouble (e.g. police activities, social workers, prisons,...)
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▪ linearly related to the number of users
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▪ non-linearly related to the number of users
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