Kodak was once the largest supplier of photographic film. in 2004 it was dropped from the dow jones industrial average after having been listed for 74 years. kodak failed to use it to fend off which one of the following of porter's 5 competitive forces?

The answer is: Threat of Substitutes

Explanation:

In this case Kodak film was replaced by a different technology (digital cameras) that solved the same economic need, photography. A digital camera captures photographs and stores them in a digital memory. There was no demand for photographic film anymore.  

Ironically, a few years later digital cameras were almost completely replaced by cell phone cameras following the same principle.

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