The relative decline in party membership in West-European countries ov
er the last three decades is an accepted fact in the comparative liter
ature on party organization. However, the bare facts do not explain th
e reasons for such decline and may leave the feeling that the process
is irreversible. A number of scholars relate party membership decline
to the introduction of public finance of political parties. They sugge
st that public financing laws and related arrangements have a negative
effect on efforts to mobilize party membership, leading to a decline
in political participation. In this article, drawing mainly on the Isr
aeli experience, I argue that public funding does not necessarily lead
to membership decline, but that changes in the internal competition r
ules for electing party candidates to national or local posts may affe
ct party membership more than any other variable. Thus, the decline in
membership that has been considered to be irreversible, is in fact hi
ghly reversible.