| Category name | Best seller rank | 50th book's rank | Median sales($) | Median price ($) | Volatility (%) | New releases (%) | Self pub.(%) | KDP Select (%) | Competition |
|---|---|---|---|---|---|---|---|---|---|
| Books > Children's Books > Early Learning > Numbers & Counting | 425 | 7,208 | £2,777 | |
95% | 5% | 15% | 0% | ~ 10,000 |
| Books > Science & Nature > Mathematics > Numbers | 849 | 362,379 | £167 | |
90% | 5% | 30% | 3% | ~ 10,000 |
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