| Category name | Best seller rank | 50th book's rank | Median sales($) | Median price ($) | Volatility (%) | New releases (%) | Self pub.(%) | KDP Select (%) | Competition |
|---|---|---|---|---|---|---|---|---|---|
| Books > Engineering & Transportation > Transportation > Railroads | 18,011 | 135,128 | $391 | |
100% | 5% | 25% | 10% | ~ 10,000 |
| Books > Engineering & Transportation > Transportation > History > Railroads | 24,034 | 1,787,783 | $553 | |
100% | 5% | 25% | 3% | ~ 3,000 |
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