Why are free riders a common problem for public goods and how does it impact the provision of these goods?

Free riders are a common problem for public goods because individuals can benefit from these goods without contributing to their provision. This can lead to underfunding and inadequate provision of public goods, as people may choose not to pay for them if they can still enjoy the benefits without cost. This can result in a lack of investment in public goods, which are essential for the well-being of society as a whole.