| Category name | Best seller rank | 50th book's rank | Median sales($) | Median price ($) | Volatility (%) | New releases (%) | Self pub.(%) | KDP Select (%) | Competition |
|---|---|---|---|---|---|---|---|---|---|
| Books > Science & Math > Physics > Optics | 8,684 | 399,509 | $502 | |
100% | 5% | 20% | 3% | ~ 9,000 |
| Books > Engineering & Transportation > Engineering > Electrical & Electronics > Fiber Optics | 14,717 | 1,838,983 | $0 | |
100% | 5% | 65% | 7% | ~ 717 |
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