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How did “negotiable” mean “a good or security whose ownership is easily transferable”?

I knew merely [the first most popular meaning of *negotiate*](https://www.investopedia.com/terms/n/negotiable.asp). I never knew  [this second legal meaning](http://www.duhaime.org/LegalDictionary/N/NegotiableInstrument.aspx)

>A document of an amount of money, or a title, which is readily transferable to another. 

[Difference between Transferability and Negotiability - SRD Law Notes](https://www.srdlawnotes.com/2018/01/difference-between-transferability-and.html)

> Negotiability also gives a right to the possessor of the property to transfer it to anyone but for consideration. The Negotiator is not required to establish his credentials. In negotiability, the property is accepted in good faith.

Where did this legal meaning hail from? [Etymonline](https://www.etymonline.com/word/negotiate) doesn't discuss it.

>### negotiate [16] 

>The etymological notion
underlying *negotiate* is of ‘not being at leisure’,
and hence of ‘being busy’. The word comes
ultimately from Latin *negōtium* ‘business’, which was a compound formed from the
negative particle *neg* and *ōtium* ‘leisure’ (source
of English otiose [18]). From it was derived the
verb *negōtiārī* ‘do business’, which passed into
English as *negotiate*. There is some early
evidence in the derivatives negotiation and
negotiator that the original Latin sense of the
word survived into English, but in the verb itself
it had already developed via ‘transact business’
and ‘hold business discussions’ to ‘hold
discussions’ generally.

*Word Origins* (2005 2e) by John Ayto. p 347 Right column.