Defense is often viewed as an archetypical public goodi.e., a product that can only be provided by government because of its non-excludability and non-rivalrous consumption. Specifically, the free rider problem, in which people refuse to pay for defense but instead rely on their neighbors to pay for defending the community, is said to make it inevitable that it be financed by taxes if an equitable allocation of costs is to be achieved. According to anarcho-capitalist theorists, there are many ways by which this problem can be overcome or rendered irrelevant. Rothbard's solution was to simply say "Who cares?" when it comes to the issue of free riders. He points out that free riders are commonplace in other aspects of our economy, asking hypothetically, "Are we to be critical because more than one person benefits from someone's actions?...In short, am I to be taxed for enjoying the view of my neighbor's well-kept garden?" He notes that we are all free riders on the past, as we would be living in a primitive society if it were not for the efforts of our ancestors; and we are free riders on the present, because we benefit from the continuing investment of our fellow men and from their specialized skills on the market. Joseph R. Stromberg notes that the American Revolution occurred despite the fact that some individuals might have been free riders who benefited from it without funding it; he opines that successful defense of freedom often relies not on precise allocations of cost, but on "nationalism, religion, the desire for freedom, hatred of the enemy, social pressure to do the right thing, and so on," some of which might represent "enlightened self interest."