There is a principle that says when a gratuitous promise to do something in the future causes someone to incur an expense, the promisor may be liable for failing to live up to that promise. What is this principle known as?

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The Answer of There is a principle that says when a gratuitous promise to do something in the future causes someone to incur an expense, the promisor may be liable for failing to live up to that promise. What is this principle known as?

There Is a Principle That Says When a Gratuitous Promise