For which type of goods is the marginal social benefit necessarily greater than the marginal private benefit?

Question

Quizplus · Accepted Answer

Public goods are non-excludable and non-rival in consumption, meaning that once they are provided, everyone can use them without reducing their availability for others. Thus, the marginal social benefit of public goods usually exceeds the marginal private benefit because individuals cannot be excluded from enjoying the benefits, leading to free-rider behavior and underinvestment in their provision.

For Which Type of Goods Is the Marginal Social Benefit