Sublime

But my purpose has been merely to demonstrate how the Jewish people, throughout their often difficult history, derived real business effectiveness and economic power from possessing a deep conviction about business being an honorable profession. This is what allowed them and, indeed, spurred them to succeed.

who speaks most disparagingly of one who seeks to profit by deceiving gentiles. He concludes stating that Divine Providence will not bless such a person’s endeavors. Even if he may profit in the short term, his money will not be graced with blessing and ultimately, will be lost.

As stated there (ibid.:11), the obligation to return the article or the money applies only when both parties are Jewish. Although it is forbidden to deceive a gentile regarding the value of merchandise, it is not forbidden to take advantage of an error the gentile makes on his own.