I'd like to start giving people the option of commenting on shorter Cold Takes pieces (which I don't cross-post here or provide audio for). I'm going to use this post for that: I will generally leave a comment for each piece, and people can leave their comments as replies to that.
I vote for innovation as mining. I've visualized an abstract version of that starting on p. 14 ("Stagnation, Redux: Like diamonds, good ideas are not evenly distributed") of this working paper, What economic growth and statistical semantics tell us about the structure of the world, piggy-backing on Romer's 1992, Two Strategies for Economic Development.