In case you didn't read the comments.....

Dr. Benjamin Mayes has, in the comments, suggested both the work he has done on the topic of usury and an article on Johann Gerhard and usury.

Check it out:

Article:

https://www.marketsandmorality.com/index.php/mandm/article/view/1465

Podcasts:
https://issuesetc.org/2021/05/25/1451-lutheran-orthodoxy-on-usury-part-1-dr-ben-mayes-5-25-21/

https://issuesetc.org/2021/05/26/1461-lutheran-orthodoxy-on-usury-part-2-dr-ben-mayes-5-26-21/