Why Unless there is an agreement to the contrary the law generally considers most agent transactions are?

Unless there is an agreement to the contrary, the law generally considers most agent transactions to be conducted on behalf of the principal. This means that any actions taken or contracts made by the agent are legally binding on the principal, provided they fall within the scope of the agent's authority. The agent is expected to act in the best interests of the principal and to disclose any relevant information. Consequently, the principal is typically liable for the agent's actions taken in the course of their duties.