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)
If you need legal help, please contact me at firstname.lastname@example.org.