Common Resource A good is a common resource if it is non excludable but rival.

Common Resource A good is a common resource if it is non excludable but rival. The Tragedy of the Commons The Tragedy of the Commons- there was town in the medieval age that had a grazing land called the "Town Common." This grazing land was for the whole town and families could allow their flock of sheep to graze free of charge. Why is it that the grazing land was not protected by individual families?