Socialism and Liberalism. Economics Humans make and trade useful tools. The value of these tools is the idle time they provide. Economic growth results in increasing human idleness. The One Good Idleness as the one good.
Useful tools make idle time, while luxuries use up idle time.
Useful Tools Humans as tools. Food as a tool. Clothing and shelter as tools. Morality and mathemetics as tools. Trade, money, prices.