I'm struggling to find a word (verb) that fits in this context:
Billy bought a book for 7 dollars and he sold it for 5 dollars. It ___ him since he should've sold the book more than 7 dollars to obtain a profit.
I can't think of another better example, but I think it should be enough to tell which verb I should use. I have phrases such as "gives a detriment to", "prejudices" or "will make him lose" but I don't think it will sound natural.