Last week’s Harvard Kennedy School PolicyCast seems to conflict with everything else we’re hearing on the street — including the news from top economists, as we recently reported, quoting Zillow’s chief economist. Christopher Herbert, managing director of the Harvard Joint Center for Housing Studies, says, “It’s more than a blip on the radar. This is a pretty fundamental shift, and one that I think is a reason for concern…. We have not yet come close to finding a bottom in the homeownership rate.”