Private goods are excludable and rival. Clothing is a private good because an item of clothing can only be used by a single user at one time. Common goods are non-excludable and rival. Examples of common goods are coal and timber because they can only be possessed or consumed by a single...
excludability (redirected fromNonexcludable good) ex·clude (ĭk-sklo͞od′) tr.v.ex·clud·ed,ex·clud·ing,ex·cludes 1.To prevent from entering; keep out; bar:a jar sealed to exclude outside air; an immigration policy that excludes undesirables. ...
Even on earth, however, if we alter the conditions and change the some factors we can imagine situations where air is a genuine economic good; Two examples include: compressed air for scuba diving or fire fighters, and “oxygen” kiosks in highly polluted cities (although I have never seen ...