I've recently begun to think about the availability of housing and how that impacts the middle/lower stratum of the US, and it seems to me that there have been several short-sighted policies put in place that have put us in a much worse position for the future for short term gain (the article explains how subsidies for single-family homes are a reason for the shift away from small apartment buildings). Has this always been happening, or has it appeared to become more pronounced with the recent focus on gentrification? What can be done to improve affordable housing? I'm not all too familiar with this field, so anything helps!