In 1935 after the publication of Tropic of Cancer, Ezra Pound challenged Henry Miller about money, “what makes it and how it gets that way.” A year later, Miller published a booklet of his thoughts and research by the same name.
The booklet is long out of print, though it has been anthologized in “Stand Still Like the Hummingbird.” There is a nice review of the booklet here with several quotes worth reading even if you don’t read either book.