Answer:
underproduced; nonexcludable
Step-by-step explanation:
Public goods tend to be underproduced because the provider can´t charge for it, that´s why it won´t get produced as much as a good that is charged to the user, the product becomes nonexcludable because it is impossible to charge the user for its use, since it is not possible to prevent the user from enjoying the good the solution is to underproduce it.