This is a defining problem of our current urban generation.<p>It's fascinating to read about the Next City study that "concludes that poor housing affordability in Philadelphia is a symptom of low income rather than of insufficient rental supply."<p>Having studied this in depth, specifically in regards to China's Ghost Town problems where they increased housing supply by many folds - Here's the current VICE documentary on it.<p><a href="http://www.youtube.com/watch?v=trs_udhjWqc" rel="nofollow">http://www.youtube.com/watch?v=trs_udhjWqc</a><p>The problem is not one of supply divorced from affordability. There needs to be both sufficient supply (ie. Not SF / LA) and there needs to be sufficient affordability (ie. Not China). Yet with these two constraints people seem to sit around wringing their hands unable to do anything. It's almost as if, politically, people are incapacitated by this problem. To which I always respond - look at Ford. The Pre-Ford cars had the same problem, lack of supply and lack of affordability. And Ford changed the equation with the Model T, by making an affordable, readily available car - thereby jump-starting the car economy worldwide.<p>We CAN do the same thing with housing. By eliminating the speculative incentives on housing (as is done in Germany) through capital gains taxation, and through multiple non-residence ownership taxation, we can address some of the market structures that diminish affordability. And on the other side we can create growth opportunities, through zoning primarily - such as a reduction in the required number of parking spaces per residence unit - and through a reduction in average square footage (which has been growing in America over the last 30 years) --<p><a href="http://www.census.gov/const/C25Ann/sftotalmedavgsqft.pdf" rel="nofollow">http://www.census.gov/const/C25Ann/sftotalmedavgsqft.pdf</a><p>And while this is just a start. This can be done. We don't even need the 'political will' to do it. We just need to do it. With just a few slight changes in the way we manage our housing inventory, both financially, and with regards to zoning and planning, we could radically alter the availability of affordable (NOT low income! or qualified housing) Over night.