Public goods are goods reported to have two distinct aspects: "nonexcludability" means that it is hard to exclude people of consumption of a good (the "free rider problem"); everyone will try to "free ride" by allowing others to pay for it and as a result the good will be unproduced, even if there is a strong demand for it. The second characteristic (considered by some less important) is "nonrivalrous consumption", when the good can be consumed without diminishing anyone else's enjoyment of it or increasing its cost. Because these goods will not be produced in a sufficient amount, or at all, they should be produced by the government.