I'm not interested in the economy, explicitly. Would you recommend this for someone who is geared towards technical writing and just getting better at it in general? I've never thought about reading a book about how to write better, to be totally honest, but how could it hurt?
Yes, it's short and insightful for all kinds of writers--technical and otherwise. The editions subsequent to the first have decreased emphasis on economics and instead geared it toward academic-style writing.