In: Economics
Rivalry -A good will be rival in nature if its consumption by one consumer prevents simultaneous consumption by other consumers meaning the consumption of a good by one person will reduce the consumption of that good for other.
Excludability - Agood is said to be excludable if it is possible to prevent consumers who have not paid for it from having access to it.
The four types of goods are
Private goods- these goods are rival and excludable. For example ham burger
Public goods - these goods are non rival and non excludable. For example pollution
Common goods- these goods are rival and non excludable. For example public waterways
Law congestional goods- these goods are excludable and non rival. For example cable television