This article is relatively old (from 2007) but nonetheless interesting. It basically says that a condition for higher productivity is access to intangible wealth. Whereas natural and built capital describe natural resources, pasture land, and machinery, equipment, infrastructure; intangible wealth include such things as trust in society, property rights, education, etc.  And the amount of intangible wealth is decisive for how productive and creative you will be. Sounds intuitive enough.

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