Generally, there is nothing wrong in changing one's mind. But sometimes it is unkind, and socially unacceptable. An example is withdrawing from a dinner engagement at the last minute. The law may make this practice impossible, or impose penalties for doing so — particularly when it amounts to a breach of contract. This book is about the very limited circumstances when changing one's mind is legally unacceptable even though it is not a breach of contract. Estoppel is a mechanism for enforcing consistency; when a person has said or done something that leads another to believe in a particular state of affairs, he or she may be obliged to stand by what they have said or done, even though they are not contractually bound to do so.
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