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How to determine duration of a common stock whose dividends grow in perpetuity?
The fact that dividends grow in perpetuity does not prevent one from calculating duration.  In fact, many academic papers look at exactly this problem, such as Lewin and Satchell.  This Wilmott thread discusses some of the pros and cons of the concept in some detail. PS: Although I was already broadly familiar with the literature and I use the duration of equities in some of my every-day work as a professional working in finance, I found the links above doing a simple google search for "equity duration."