Full Idea
The principle tenet of capitalism is that economic growth is the supreme good, or at least a proxy for it, because justice, freedom, and even happiness all depend on economic growth.
Gist of Idea
The main rule of capitalism is that all other goods depend on economic growth
Source
Yuval Noah Harari (Sapiens: brief history of humankind [2014], 16 'Growing')
Book Reference
Harari,Yuval Noah: 'Sapiens: a brief history of Humankind' [Vintage 2014], p.351
A Reaction
In this respect, the main opponent of captitalism is green politics, rather than marxism.