It's not a 'strong statement'. It's a statement supported both by rationality (more inputs spread out across less users) and empiricism -- there's countless case studies arriving at same conclusions. Here's some from Strong Towns: i) https://www.strongtowns.org/journal/2018/8/3/cobb-county-add... ii) https://www.strongtowns.org/journal/2018/9/27/a-texas-sized-...