If you're curious, Martin Luther (of Lutheranism) wrote on this [1], summarized here [2] although the original is quite legible. Mercantilism (i.e. profit-making on the exchange of goods) was a very popular way of making ones' livelihood in his time and place, so it was a frequent question religious leaders were asked to weigh in on. Essentially, "how much profit is too much profit?"

[1]: (PDF) https://opensiuc.lib.siu.edu/cgi/viewcontent.cgi?article=501...

[2]: (PDF) https://history.hanover.edu/hhr/18/HHR2018-fergus.pdf