noun
philosophy of money; one's approach to earning, saving, and spending
Refers to a personal set of beliefs or principles about how to handle money, often used in discussions about financial habits or life values.
彼の金銭哲学は「稼いだ分だけ使う」というものだ。
His philosophy of money is 'spend only what you earn.'
金銭哲学が違うと、一緒に暮らすのは難しい。
If your philosophies of money differ, living together is difficult.
金銭感覚 refers to one's sense or intuition about money (e.g., being good or bad with money), while 金銭哲学 is a more deliberate, thought-out set of principles.
Compound of 金銭 (money) and 哲学 (philosophy). The exact origin is uncertain, but it likely emerged as a modern term for one's financial principles.