> Denser areas are cheaper per housing unit. That's not exactly true. Now sure, if everything else is equal then yes it is true. Building a small apartment bu

> Denser areas are cheaper per housing unit. That's not exactly true. Now sure, if everything else is equal then yes it is true. Building a small apartment building on the same land as a single house will result in more units than the cost multiplier of the build, so as you say, they'll be cheaper. But everything else is never equal. It only makes sense to do such increased density in an area that is becoming more and more expensive and the delta increased density will make the area even more expensive. NYC is the densest area in the US, and is not exactly known for the cheaper per-unit housing costs.