A proverb meaning that money can generate more money (through investment, interest, etc.).
彼は若いうちに株式投資を始め、金が金を生むのを実感した。
He started investing in stocks when he was young and felt how money begets money.
貯金だけでは増えない。上手に運用しないと金が金を生むとは限らない。
Savings alone won't grow. Without good management, money won't necessarily generate more money.
スタートアップに投資するのはリスクもあるが、当たれば金が金を生む。
Investing in startups carries risks, but if it pays off, money can generate more money.