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Default search mode looks for fields matching at least one keyword match:
Eg. Science Fiction looks for fields matching either science OR fiction

Use quotes to search for literal phrases:
Eg. "Business Culture"

Use - sign to exclude keywords from a particular field:
Eg. business -marketing

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Find the most profitable Kindle niche categories

Category name	Best seller rank	50^th book's rank	Median sales($)	Median price ($)	Volatility (%)	New releases (%)	Self pub.(%)	KDP Select (%)	Competition
Books > Crafts, Hobbies & Home > Antiques & Collectibles > Sports Memorabilia & Cards	35,678	343,056	$399	$14.28	100%	0%	30%	10%	~ 983
Books > Crafts, Hobbies & Home > Antiques & Collectibles > Sports Memorabilia & Cards > Sports Cards	57,912	481,259	$417	$14.9	95%	0%	50%	17%	~ 582
Books > Crafts, Hobbies & Home > Antiques & Collectibles > Sports Memorabilia & Cards > Sports Memorabilia	50,929	918,588	$268	$9.6	100%	0%	30%	0%	~ 460

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