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IPI: Inter Purchase Interval<br />

The time between shopping trips to buy a<br />

category or product.<br />

• Changes according to category and channel type<br />

• Back to our milk and shampoo example: the milk<br />

might have an IPI of 2.5 days and shampoo 30<br />

days at the frequency level we described above<br />

• The goal <strong>here</strong> is the converse of Frequency (same<br />

concept but different lens) – we are trying to<br />

decrease IPI.

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