I don't have the answers for that - but off the top of my head (and as someone who breastfed for more than a couple of years) - I would think that there is a limit to collecting plasma. Breastmilk, otoh, had I kept up my diet, and continued to use it - it could have gone on all day, every day, for decades.......
Do we really want a class of women, milked for profit? Like that? (I'm thinking of the worst case scenario - and I see no reason why it wouldn't look like that........). The images I am conjuring are pretty horrific
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I don't know anything about blood plasma so it's hard for me to respond. I do know that you can't just give all day as a job. That's not true of breastmilk.
This article says we export plasma (I didn't know that). https://www.supermoney.com/economy-blood-donations/
It also says that plasma donation comes with risks (long term donation, in particular).
But again, I don't know much about that - perhaps others would have to weigh in on risks. It looks like the travel of plasma is from a developed country to an undeveloped one (or laterally to another developed country)? But perhaps this is a dated article.