| Category name | Best seller rank | 50th book's rank | Median sales($) | Median price ($) | Volatility (%) | New releases (%) | Self pub.(%) | KDP Select (%) | Competition |
|---|---|---|---|---|---|---|---|---|---|
| Kindle eBooks > Science & Math > Physics > Optics | 26,246 | 804,383 | £139 | |
95% | 0% | 25% | 47% | ~ 1,000 |
| Kindle eBooks > Professional & Technical > Technology & Engineering > Optics | 184,643 | 2,131,095 | £0 | |
95% | 0% | 10% | 17% | ~ 1,000 |
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