Consider this sentence:<p>"That inability is mushrooming, driven by increasing rents across much of the country and wages that aren’t going anywhere."<p>One has to wonder: where is the money coming from that drives up these rents, if wages are stagnant? The issue is supply and demand.<p>Why has supply decreased? Part of the answer is the housing bust, which followed the housing boom (irrational exuberance was counter balanced by irrational pessimism):<p><a href="http://www.calculatedriskblog.com/2013/09/ny-times-on-shortage-of-buildable-lots.html" rel="nofollow">http://www.calculatedriskblog.com/2013/09/ny-times-on-shorta...</a><p>As it says there:<p>"The latest land rush is in full swing, as developers realize that they have failed to feed the zoning, permitting and mapping pipeline, which can take months or years to turn raw fields into buildable lots."<p>The other side of the supply and demand issue is the increase of foreign demand. Some of the money comes in the form of foreign money that speculates in the American real estate:<p><a href="http://www.nytimes.com/2011/07/07/nyregion/more-apartments-are-empty-yet-rented-or-owned-census-finds.html?pagewanted=all" rel="nofollow">http://www.nytimes.com/2011/07/07/nyregion/more-apartments-a...</a><p>As it says there:<p>"But some Manhattan neighborhoods are assuming that vacant feeling the year round, because the people who own or rent apartments there actually live somewhere else most of the time. "<p>A combination of housing bust and foreign speculation in USA real estate leads to a situation where rents go up even when wages are stagnant or falling.<p>-----------<p>A possible explanation of the international forces at work is offered here:<p><a href="http://krugman.blogs.nytimes.com/2013/09/26/trade-and-secular-stagnation/" rel="nofollow">http://krugman.blogs.nytimes.com/2013/09/26/trade-and-secula...</a><p>This was interesting to me:<p>"So the causation could run the other way, with deregulation and rising leverage pulling in foreign capital, keeping the dollar overvalued, and producing persistent deficits."