Mark is a real estate broker who represents a buyer in a transaction. He recommended a mortgage broker to help his client obtain financing for a property. What the client doesn't know is that Mark will receive a referral fee from the mortgage broker if the client obtains a mortgage from the mortgage broker. This is a breach of which fiduciary duty...?

Accountability

Explanation:

A Fiduciary is an agent for a Principal/Client. The legal or special relationship of trust, confidence, or responsibility between two or more parties, most commonly a "Fiduciary" and a "Principal/Client", is called the Fiduciary Duty.

There are various fiduciary duties an agent owes a client, these duties include, honesty, confidentiality, loyalty, full disclosure, care and accountability.

The duty of accountability requires the agent to report to the principal promptly all money and property received and paid out, and upon request, to tender an account of these actions.

Hence the action of Mark is a breach of the fiduciary duty of Accountability.  

answer; /// i believe the correct answer is (market share); good luck

answer; ( prices are sticky);