"Admittedly regulating party and campaign finances is a difficult task. There is a wide variety of regulations in operation throughout Europe and other world regions. Regulations may refer to party funding as a whole (including “routine activities”) or only to electoral campaigns. Some countries apply direct public financing, others allow only private financing. There are systems with contribution and expenditure limits, and others without them. There may be bans on certain types of contributions, as well as on certain types of expenditure. Moreover, electoral and party laws differ considerably with regard to the disclosure of party and campaign funds as well as with regard to the public access to the disclosed information. The variety of regulations makes it difficult to set common standards. "
CoE (Venice Commission): Report on Electoral Law and Electoral Administration in Europe, para.VI.99

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Report on Electoral Law and Electoral Administration in Europe