Dividing the economy into different kinds of goods

	Excludable	Non-Excludable
Rival	Private goods food, clothing, cars, personal electronics	Common goods (Common-pool resources) fish stocks, timber, coal
Non-Rival	Club goods cinemas, private parks, satellite television	Public goods free-to-air television, air, national defense

Because it's so important, here is a table (via a previous Wikipediaentry) which I eventually figured out how to do in html.

It builds on the discussion of rival and excludable goods in the previous post.

As more of the economy migrates from private goods to the other quadrants, the institutions and questions need to change.