The strategy the speaker uses to develop the central idea of "Money to Us Is of No Value" is:
He identifies a problem and proposes a solution.
1. By identifying a problem, the speaker brings attention to an issue or challenge that needs to be addressed within the context of the speech.
2. By proposing a solution, the speaker offers a way to resolve or improve the situation presented in the speech, leading to a central idea that revolves around addressing the identified problem.
This strategy helps to develop and reinforce the central theme of the speech, focusing on the value of money or the lack thereof in the specific context presented by the speaker.