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Find the most profitable Kindle niche categories

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Category name Best seller rank 50th book's rank Median sales($) Median price ($) Volatility (%) New releases (%) Self pub.(%) KDP Select (%) Competition
Kindle eBooks > Science Fiction & Fantasy > Science Fiction > Military > Space Marine 236 6,361 $8,802 $4.99 100% 75% 50% 100% ~ 5,000
Kindle eBooks > Children's eBooks > Animals > Fish & Marine Life 3,126 89,734 $838 $4.99 90% 21% 40% 63% ~ 3,000
Kindle eBooks > Children's eBooks > Animals > Fish & Marine Life > Marine Life 3,307 123,656 $558 $4.99 95% 15% 30% 60% ~ 2,000
Kindle eBooks > Science & Math > Biological Sciences > Biology 1,365 260,630 $279 $9.99 90% 10% 20% 17% ~ 10,000
Kindle eBooks > History > Science & Medicine > Biology & Nature 16,216 310,449 $363 $12.99 85% 15% 5% 10% ~ 495
Kindle eBooks > Science & Math > Biological Sciences > Biology > Marine Biology 35,218 439,231 $335 $11.99 95% 5% 15% 23% ~ 1,000
Kindle eBooks > Science & Math > Biological Sciences > Biology > Cell Biology 29,344 489,835 $279 $9.99 95% 10% 35% 33% ~ 3,000
Kindle eBooks > Science & Math > Biological Sciences > Biology > Entomology 39,280 522,452 $274 $9.79 100% 11% 21% 13% ~ 1,000
Kindle eBooks > Science & Math > Biological Sciences > Biology > Microbiology 57,987 526,575 $279 $9.99 100% 0% 40% 20% ~ 2,000
Kindle eBooks > Science & Math > Biological Sciences > Biology > Molecular Biology 55,092 709,384 $377 $13.49 95% 5% 45% 33% ~ 5,000
Kindle eBooks > Science & Math > Nature & Ecology > Oceans & Seas > Marine Life 22,372 735,340 $307 $10.99 90% 5% 15% 20% ~ 412
Kindle eBooks > Science & Math > Biological Sciences > Biology > Developmental Biology 160,888 991,447 $0 $9.99 100% 0% 15% 20% ~ 1,000