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Laws vary from state to state.
In general, the agreements must be in writing and signed by the parties. This way the parties will know more about what they might be giving up. In some states, it may be possible to waive a full disclosure of income and assets, but the waiver should be done knowingly and it is best if each party has a general idea of the other's net worth. The agreements also must not be the result of fraud or duress. For example, if a man hides assets from his future wife so that she will agree to a low level of support in case of divorce, a court probably would declare the agreement invalid.