Duration gap

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In Finance, and accounting, and particularly in asset and liability management (ALM), the duration gap is the difference between the duration - i.e. timing - of assets and liabilities held by a financial entity. [1] An alternate approach is to see the "duration gap" as the difference in the price sensitivity of interest-yielding assets and the price sensitivity of liabilities (of the organization) to a change in market interest rates (yields). [2]

The duration gap thus measures how well matched are the timings of cash inflows (from assets) and cash outflows (from liabilities), and is then one of the primary asset–liability mismatches considered in the ALM process. The term is typically used by banks, pension funds, or other financial institutions to measure, and manage, their risk due to changes in the interest rate; see Asset and liability management § Managing gaps and Financial risk management § Investment management.

By duration matching, that is creating a zero duration gap, the firm becomes immunized against interest rate risk. Duration has a double-facet view. It can be beneficial or harmful depending on where interest rates are headed.

A formula sometimes applied is:

Implied here is that even if the duration gap is zero, the firm is immunized only if the size of the liabilities equals the size of the assets. Thus as an example, with a two-year loan of one million and a one-year asset of two millions, the firm is still exposed to rollover risk after one year when the remaining year of the two-year loan has to be financed.

Further limitations of the duration gap approach to risk-management include the following:

See also

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References

  1. Lee, Cheng-Few; Lee, Alice C. (2006-05-05). Encyclopedia of Finance. Springer. pp. 423–. ISBN   9780387262840 . Retrieved 15 February 2013.
  2. Skinner, Frank (2004-10-29). Pricing and Hedging Interest and Credit Risk Sensitive Instruments. Butterworth-Heinemann. pp. 218–. ISBN   9780080473956 . Retrieved 15 February 2013.