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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 > Engineering & Transportation > Engineering > Mechanical 790 95,086 $4,473 $17.75 95% 5% 20% 0% ~ 60,000
Books > Engineering & Transportation > Engineering > Mechanical > Machinery 10,793 207,314 $410 $14.67 95% 0% 20% 3% ~ 6,000
Books > Engineering & Transportation > Engineering > Mechanical > Welding 22,920 345,116 $960 $34.32 100% 0% 35% 0% ~ 4,000
Books > Engineering & Transportation > Engineering > Mechanical > Hydraulics 15,115 734,655 $1,377 $49.2 90% 0% 20% 7% ~ 8,000
Books > Textbooks > Engineering > Mechanical Engineering 13,065 1,495,184 $2,424 $86.59 95% 5% 15% 0% ~ 10,000
Books > Engineering & Transportation > Engineering > Mechanical > Tribology 23,960 2,931,705 $0 $57.42 95% 0% 60% 0% ~ 409
Books > Engineering & Transportation > Engineering > Mechanical > Drafting & Mechanical Drawing 17,953 3,585,113 $531 $18.98 100% 10% 80% 7% ~ 2,000