+A good is **non-excludable** when it is difficult or impossible to prevent individuals from consuming it, even if they don't pay. This characteristic often leads to the [Free Rider](/wiki/Free_Rider) problem and is a defining feature of [Public Goods](/wiki/Public_Goods).
+## See also
+- [Rivalrous](/wiki/Rivalrous)
+- [Common Pool Resources](/wiki/Common_Pool_Resources)
+- [Market Failure](/wiki/Market_Failure)