1. When people talk about the death of density & the coming decline of say NY & San Francisco, the two densest cities in America, they should understand that if that were to happen it would basically destroy the engine of American innovation.

2. Together the San Francisco Bay Area and the Acela Corridor extending out from NYC to Boston & DC houses three-quarters of America's venture capital-financed high-tech startups. https://www.bloomberg.com/news/articles/2018-03-27/the-extreme-geographic-inequality-of-high-tech-venture-capital

3. If those city-regions & their entrepreneurial ecosystems were to collapse, it is less likely that high-tech innovation would magically shift to other US cities or suburbs. And much more likely that it would shift to cities & ecosystems in other countries.

4. Which is EXACTLY what has been happening. So the decline of US cities if it is to actually happen, would do a ton of damage to America's innovation system & economic competitiveness ... https://hbr.org/2018/11/how-the-geography-of-startups-and-innovation-is-changing

5. Seems like something we might want to take seriously ...