That's what economist Mark Zandi is quoted as saying in an article discussing the extent to which the housing crash is reducing mobility, because people can't sell their homes. The problem is that the chart that accompanies the article (produced by Mr. Zandi's firm, Moody's Economy.com) indicates the opposite. The chart shows that interstate mobility fell as the unemployment dropped throughout the 90s. It remained relatively low in this decade before rising rapidly in 2004. If this rise in mobility is a response to the economic growth, then the economy is displaying the exact opposite reaction from the 90s, when a stronger economy was associated with less mobility.
--Dean Baker