Final answer:
The agency between Gordon and Josh will end when Gordon decides to look for another agent.
Step-by-step explanation:
In this scenario, the agency between Gordon and Josh will end when the agreement is silent. When an agreement does not specify an end date or condition, it is considered to be an undisclosed agency.
An undisclosed agency typically ends when the purpose for establishing the agency is achieved or when one of the parties involved decides to terminate it.
Therefore, in this case, the agency between Gordon and Josh will end when Gordon decides to look for another agent.