| Category name | Best seller rank | 50th book's rank | Median sales($) | Median price ($) | Volatility (%) | New releases (%) | Self pub.(%) | KDP Select (%) | Competition |
|---|---|---|---|---|---|---|---|---|---|
| Children's Books > Science, Nature & How It Works > Inventions & Inventors | 12,442 | 77,611 | $876 | |
100% | 0% | 15% | 0% | ~ 1,000 |
| Books > Engineering & Transportation > Engineering > Reference > Patents & Inventions | 6,475 | 124,980 | $1,611 | |
85% | 0% | 25% | 7% | ~ 1,000 |
| Books > Teens > Education & Reference > Science & Technology > Technology > Inventions | 28,196 | 825,654 | $330 | |
100% | 5% | 25% | 13% | ~ 265 |
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