In Friday's WSJ Fund Track column, Diya Gullapalli explains how a freeze up in the so called "auction rate" debt market is causing headaches for closed-end funds. Gullapalli writes that closed-ends funds that had been using leverage to boost returns are finding it hard to tap the auction-rate securities market because of problems caused by the credit crunch. This has left the funds seeking other forms of short-term debt to invest in.  

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