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How does concernō relate to ‘commercial enterprise' ?

> ["concern" is quite old English for an establishment or business of some kind.](https://old.reddit.com/r/Accounting/comments/6sybc1/huh_the_verge_doesnt_actually_know_what_going/dlhfucc)“

 How did this [business meaning  of *concern*](https://reddit.com/r/etymology/comments/yivsb8/explaining_concern_from_its_etymology/iulmwl5) develop from the Latin *concernō* that meant [“to mix, sift or mingle together (especially as in a sieve”)](https://en.wiktionary.org/wiki/concerno#Etymology)  ?      

How does *concernō* relate to this [obscure meaning where it means “business"](https://old.reddit.com/r/Accounting/comments/hrhwof/am_i_the_only_one_that_thinks_the_phrase_going/fy4voto) ? 

How does mixing and mingle relate to ‘[an establishment for the transaction of business](https://www.etymonline.com/word/concern#etymonline_v_46683)’?    


 Does [*"concern"* in the sense of "worries"](https://news.ycombinator.com/item?id=14087397) have any role to play?


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All my questions above were not answered in any of these similar posts.

https://www.physicsforums.com/threads/how-did-concern-semantically-shift-to-mean-commercial-enterprise.1061373/ 

https://www.reddit.com/r/etymology/comments/1cx2g7t/how_does_concern%C5%8D_relate_to_commercial_enterprise/ 

https://forum.wordreference.com/threads/how-does-concern%C5%8D-relate-to-commercial-enterprise.4101305

https://historum.com/t/how-did-%E2%80%98concern%E2%80%99-semantically-shift-to-mean-%E2%80%98commercial-enterprise.198340/ 

https://www.reddit.com/r/latin/comments/1db996b/how_does_concern%C5%8D_relate_to_commercial_enterprise/ 

https://thephilosophyforum.com/discussion/15227/how-did-concern-semantically-shift-to-mean-commercial-enterprise- 

https://www.englishclub.com/esl-forums/viewtopic.php?t=85349 

https://latin.stackexchange.com/q/23633