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The Gemara on our daf presents a series of cases where it appears that the woman is accepting kiddushin from the man, but upon closer examination of the case, she may be rejecting it.
For example, if a man hands a woman a coin and says, “Hitkadshi li be-maneh – marry me with this coin,” and she takes it from him and throws it into the ocean or into a fire, we interpret her actions to mean that she is rejecting his offer of marriage.
Rava quoted Rav Nachman who taught that if a man offers a particular sum for kiddushin and he gives a security item (משכון) in its place, the kiddushin is not valid. The reasoning is also presented.
The money for kiddushin is not here, and the security was never meant to be the item given for the kiddushin, it was only a placeholder. Therefore, nothing was given to the woman.
We explore these differences between money and merchandise in the act of kinyan.