| 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 > Education & Reference > Reading & Writing > Vocabulary & Spelling | 625 | 7,483 | £1,816 | |
90% | 0% | 5% | 0% | ~ 4,000 |
| Books > Reference > Language > Vocabulary | 2,460 | 33,604 | £766 | |
100% | 0% | 0% | 0% | ~ 9,000 |
| Books > Young Adult > Education & Reference > Language Arts > Vocabulary & Spelling | 4,422 | 141,700 | £222 | |
95% | 5% | 10% | 0% | ~ 152 |
| Books > Languages > English as a Foreign Language > Grammar & Vocabulary | 6,720 | 482,347 | £315 | |
95% | 5% | 35% | 0% | ~ 572 |
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