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One way might just be to find a more cost-effective way to make that same salt, and put those farmers out of business.

A hack might be to use drones to run surveillance on those places.

The longer-term and stable solution is to have governments or community to care for those people so they are not homeless and vulnerable.

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Yes. Perhaps inventing a technology that would eliminate the need for slaves and selling it to the farmers at a price point below the cost of slaves.

Also, perhaps a salt farm that was operated by the homeless, set up as a social enterprise and branded as such. Since this seems to be a luxury item, the increased price and status could be desirable.

Create automation to produce the salt, organize a B Corp [+], use any profits from the production to support the homeless and mentally ill.

[+] http://www.bcorporation.net/

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