Final answer:
A single agent broker with only one client can be paid by both the client and the customer through a commission split arrangement.
Step-by-step explanation:
In the case of a single agent broker with only one client, the broker can be paid by both the client and customer, but this would typically occur through a commission split arrangement. In this scenario, the broker negotiates a commission with the client upfront and then receives a portion of the commission from the customer as well. For example, let's say the broker negotiates a 5% commission with the client, and the customer agrees to pay a 3% commission. The broker would then receive 2% (5% - 3%) from the customer.