Comparedtolifecyclestudieswithashorttimehorizon(suchasthoserelatingtopurchaserequirementsorecolabellingofproductsontheexistingmarket),studieswithalongtimehorizonmustdealwiththefollowingchangingconditions:
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Compared to life cycle studies with a short time horizon (such as those relating to purchase requirements or ecolabelling of products on the existing market), studies with a long time horizon must deal with the following changing conditions: