According to Black’s Law Dictionary, unjust enrichment is
the retention of a benefit conferred by another, without offering compensation, in circumstances where compensation is reasonably expected.
In Massachusetts, establishing unjust enrichment requires:
(1) a benefit conferred upon the defendant by the plaintiff;
(2) an appreciation or knowledge by the defendant of the benefit; and
(3) acceptance or retention by the defendant of the benefit under the circumstances would be inequitable without payment for its value)
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