Declining numbers of party members in Europe have led to the presumption that over time parties will disappear as membership organizations . This view is opposed by the normalization thesis, which predicts that membership parties will survive albeit on low levels . But how likely is it that they will either disappear or normalize their membership numbers? Membership developments are subject to a business cycle and in Germany it reached its climax between the mid-1970s up until shortly after the German reunification in the early 1990s . Since then there has been a steady decline in membership, mainly due to a lack of entries, an increase of resignations and a steadily growing cohort of older party members passing away . According to the normalization thesis, membership numbers are expected to continue to decline following the extraordinary inflow of members in the mid-1970s and early 1990s . In the longer term it is expected that those numbers will stabilize . By means of a time series analysis their development is estimated up to 2030 . The results show that more members will join than leave . When this phase - in which a large share of resignations is owed to members passing away - subsides, the numbers of entries and exits are likely to align .
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