Assuming he enters into a contract on her behalf on Tuesday. Larry has breached: duty of obedience.
Duty of obedience can be defined as the way of complying with the instruction given or following an instruction given without deviating or changing it.
Based on the scenario Larry has breach the duty of obiedience because he did not comply with the instruction that Mary gave him.
Therefore Larry has breached: duty of obedience.
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