There are some market-research companies which have very detailed sector specific knowledge. Thus, they are not freely available for consumers.
Here are a few to get you started:
http://www.mintel.com/
https://www.marketresearch.com/
https://www.marketresearchreports.com/
https://www.ibisworld.co.uk/

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There are plenty of research sources, some of them specialized in a certain area. but usually, the free sources are more generalize and poorer than the chargeable sources,
below some of the greatest well-known search sources:
1/ www.ourworldindata.org
2/ www.reportlinker.com
3/ www.statista.com