Caroline's behavior conforms to the following, first, that she provides services designed to help the Smiths, and that the Smiths are aware of them. Second, she helped the Smiths when she did housework. Third, Caroline's housework is good for the Smiths. Fourth, Caroline didn't say she did the housework for the Smiths for free. This is in line with the meaning of the implied contract. So Caroline has the right to a reasonable value for the services she provides.
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