In another example, Denmark expanded the scope of its system to encompass non-refillable mineral water bottles (Pro Europe,(n.d.)142|). It is thought that there are over 20 million informal sector recyclers globally (IIED, 2016t43]) and that the indirect services they provide to municipalities in the form of waste collection and recycling are considerable. Indeed, there is some evidence that higher income countries have slightly lower recycling rates due to informal sector workers being displaced by formal waste management systems (UNEP, 2014(27]). Low' value plastics will either be ignored or discarded. Anecdotally it is understood that, in this context, “demateralisation” of plastics packaging (i.e. designing packaging that uses less material, for cost-saving and/or environmental reasons) can actually dis-incentivise informal collection. In countries where the informal sector plays a key role in collecting waste plastics, the development of formal waste management systems that do not integrate well with the existing informal sector can create a risk of lower recycling rates.