Promissory Estoppel, Proprietary Estoppel and Constructive Trust in Canada: "What's in a name?"

This paper explores the similarities and differences between promissory estoppel, proprietary estoppel and the remedial constructive trust. Although the three are quite different at one level, as the first is a defence to an action, the second a cause of action as well as a defence, and the third simply a remedy to a cause of action, a closer examination reveals certain underlying similarities. The comparison highlights proprietary estoppel, an oft-overlooked concept in Canada, but which is comparable to promissory estoppel at the substantive level and the constructive trust at the remedial level.