There are pros and cons to what I call "winner stability". This metric captures the rate that last year's winning items maintain winning status this year.
The "right" rate is different for everybody. If you sell the same products year-after-year, a drop in winner stability from 93% to 79% is a catastrophe. Fashion brands wouldn't even bother to measure the concept.
When winner stability declines and new item introductions suffer, your business will suffer.
Therefore, measure "winner stability" carefully ... once a month should be sufficient. Look for changes in the metric, and do some digging if you see rates drop suddenly.
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