I'm at about 11,000 words (about 1/3 of my goal — about the same length as A Random Physicist Takes on Economics). At this rate, I'll probably be done much sooner than the end of 2019. I've finally collected all of the data I think I need and analyzed it with the dynamic information equilibrium model. On my more technical blog, I wrote a bit about one of the newer analyses looking at unionization and inequality. In that blog post I tested my draft diagrams for the book (in black and white so they render on a Kindle). Click to enlarge:
I also updated the cover art. I changed the color to be more blue — the same blue as on the cover of A Random Physicist .
 You can see them side by side (plus an alternate less spaced-out title):
I think I might go for Century Gothic or Futura (on which it was originally based) for the cover font for that Keynesian-era feel ...
And here are the spaced-out title versions:
Ok, one last pair — this one includes two data series in the first version above, but were left out in all the single spaced versions. The data was left out because it's actually left out in the diagram inside the book, but also it increases the size of the spacing between lines by about 10% so the single-spaced version isn't cramped. At this point, I'm leaning Futura but then the kid loves Gorillaz and Studio Ghibli which use Century Gothic (the former on the Demon Days cover, the latter in their English titles).