I'm confused.
The book was in the number 5 position and was selling 500+ copies a day.
Then it dropped to number 21. You say sales 'collapsed' but what does that mean? The thread title implies that the sales dropped by 500/day. (In other words, it went from 500 to zero or 1000 to 500 or something like that.) But the sales can't have dropped to zero if it was still at 21.
I agree that being a '5', then '21', then '5', then '21' again seems odd.
The book was in the number 5 position and was selling 500+ copies a day.
Then it dropped to number 21. You say sales 'collapsed' but what does that mean? The thread title implies that the sales dropped by 500/day. (In other words, it went from 500 to zero or 1000 to 500 or something like that.) But the sales can't have dropped to zero if it was still at 21.
I agree that being a '5', then '21', then '5', then '21' again seems odd.
