&gt;  So you now have 30-40% more people on the sidewalks. 30-40% more cars on the road. 30-40% higher density.<p>This is the fallacy that the article is pointing at: an increase in 50% pop density doesn&#x27;t result in a 50% increase in everything: mass transit is the best example of this, higher density enables much more efficient mass transit systems. A lower density city will have most people go to work by car, a higher density one will easily have over 50% of the population commute to work by mass transit and bicycle.