Housing data has been improving in recent months, but Professors Robert Shiller and Karl Case (creators of the S&P/Case-Shiller Home Price Indices) say several potential problems are on the horizon for the housing market. Shiller and Case tell Bloomberg that looming resets to option ARM mortgages, a “shadow inventory” of homes that are currently owned but will soon be on the market, and a lessened stigma about defaulting on a mortgage are all issues that could have a big impact on the housing market going forward.

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