What are the fallacies of public goods?

Public goods are not always good. These goods are things built for the collective and do not cost more for each additional person. Public goods are also not exclusive. Regardless of whether you had paid for it, it is practically impossible to prevent anybody from using it. Most people do not want to pay for it because it is free. The claim for government production of public goods is that because there will be little funding for it, there will be less of it produced. However, there is no way for the government to be able to tell how much of any public goods are actually wanted.