Open-end funds in a relevant scale as an investment for the general public are internationally found only in Germany. All attempts to establish open-end funds as an investment for general public in Great Britain, Australia or the Netherlands were essentially in vain. The Swiss open-end funds, upon which the German legislation was originally based on, also turn out to be closed-end funds, due to several amendments, by now. The discrepancy between the illiquidity of the property and the permanent issuance and withdrawal of shares has proves to be particularly problematic. A systematic analyses, how open-end funds have to be designed, to fulfill this antagonism is missing so far. This article tries to close this gap.