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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
Books > Fiction > War 6 2,428 £4,186 £2.99 95% 30% 5% 25% ~ 40,000
Books > History > Military History > World War II 1939-1945 212 2,632 £2,234 £3.99 100% 7% 30% 17% ~ 60,000
Books > Biography > War & Espionage 173 4,403 £2,934 £4.99 90% 15% 0% 28% ~ 30,000
Books > Biography > War & Espionage > World War II 286 6,666 £1,172 £3.49 100% 20% 0% 12% ~ 10,000
Books > History > Military History > World War II 1939-1945 > Holocaust 266 7,038 £2,084 £8.27 100% 14% 30% 8% ~ 9,000
Books > Society, Politics & Philosophy > Government & Politics > Civil Liberties & Political Activism 628 10,796 £2,076 £8.24 100% 6% 25% 5% ~ 30,000
Books > Science & Nature > Engineering & Technology > Civil Engineering 656 12,408 £1,260 £15 100% 21% 40% 3% ~ 100,000
Books > History > Military History > World War II 1939-1945 > Biographies & Memoirs 659 16,125 £1,078 £5.5 100% 20% 25% 3% ~ 8,000
Books > Biography > War & Espionage > Special Forces 1,599 19,386 £441 £5.25 77% 22% 0% 6% ~ 890
Books > History > Military History > World War I 783 20,114 £770 £9.17 100% 20% 25% 8% ~ 20,000
Books > Science & Nature > Engineering & Technology > Civil Engineering > Environmental 507 20,488 £717 £12.82 95% 46% 35% 0% ~ 70,000
Books > Science & Nature > Engineering & Technology > Civil Engineering > Building Construction & Materials 523 22,091 £684 £12.22 95% 7% 50% 0% ~ 20,000