This book analyses the theory of efficient breach in English sales law, European Union contract law and Chinese contract law. It analyses the framework of the efficient breach theory and reconsiders the implications of this theory. According to the traditional efficient breach theory, the remedy of expectation damages is able to motivate efficient breach, which brings the breaching party economic surplus without making the non-breaching party worse off. The essential problems are how to motivate contract parties to make rational decisions and how to solve cases where performance of a contract...