In the context of marginal analysis, which of the following best describes the point at which social optimality is achieved?

In marginal analysis, social optimality is reached when the benefits of a good or service equal its costs. This means that the last unit produced provides just enough value to society to cover the resources used to make it. For example, if a factory produces widgets, social optimality occurs when the price people are willing to pay for the last widget matches the cost of producing that widget. At this point, resources are used efficiently, and society as a whole is not better off by making more or fewer widgets. Therefore, achieving social optimality ensures that resources are allocated in the most beneficial way for everyone involved.