I have a finance specialization. Tough industry to be in if you're fresh out of university, so I used to write articles.
At the time: I was a Native English speaker, bachelor's degree, had half my analyst's designation done, and about 2 years industry experience. I wrote 800+ articles, 400-800 words each. I would charge a fixed rate per article (so if it was 800 words I got paid the same as 400). I kept stats on my writing so that I could bid against all the low-ballers out there.
I wrote articles at an average rate of 12minutes, with a 3 minute standard deviation. If I made $10 (USD) per article I was a happy guy. $35 gigs were my "premium" clients. Occasionally, I would get 2,000+ word works, and I would price them at a $35/400word rate. People wouldump frequently bonus me, or pay me in something better than USD, so maybe bump those numbers up a bit.
The biggest issue was always research. It took about 30-40 minutes to research a single topic. My sources were all journal of finance-level and CFA/Accounting textbook stuff, none of this news-spinning garbage. That being said, once I had the research done I could pump out about 5-12 articles (finance is a good topic for applying research broadly, not sure so much for other niches). I would therefore push to get bulk deals.
Along the way I picked up a few tricks. Discounts to depositphotos and an animoto account (big shout-out to appsumo for that shit). I would throw in 30s videos and images for bulk purchases and regulars, along with some microsoft smart-art diagrams. Didn't change my cost-base and created huge perceived value. People loved that shit, so it kept the Indian and Filipino low-ballers out of my honey-pot.
I averaged $26/hr (USD)s and was pretty damn happy with it. $60-70 per article is pant-shittingly good, so I hope they are writing thesis papers in blood for you. Health might have different pricing though. Tonnes of hungry idiots with BCom's that will work for cheap, not so sure about people with health/science backgrounds.
Hope that helps.