Since the amount of tangible matter in the world is fixed, the growth and deployment of intangible capital in the production process must be the sole source of productivity growth and thus our ability to enhance the (material) quality of life. This survey article takes stock of our knowledge...

The amount of physical matter in the world is fixed and improvements to people's material circumstances are only created by their ability to reconfigure this matter. What distinguishes labour, and subsequently what allows for differing increments of value, are our capabilities, skills and...