This fiduciary duty requires the broker to always act in the best interest of the principal, to the exclusion of all other interests, including that of the broker:

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The duty of loyalty requires a broker (or any fiduciary) to act in the best interests of the principal, prioritizing the principal's interests above their own or those of any third party. This includes avoiding conflicts of interest and not benefiting at the expense of the principal.

This Fiduciary Duty Requires the Broker to Always Act in the Best