Honesty in Business

 Menoras HaMeor (08) The greed of men and their pursuit of the pleasures of the world causes them to oppress their fellows in all their business, and in their work and in their goods. And perhaps they think that this oppression, since it is not theft  is not prohibited therefore the Torah warns us  by saying, "No one should oppress his brother", to teach us that a person must conduct business honestly, even though everyone who engages in business has no intention but to profit from it Nevertheless  the Torah commands that he neither take nor sell for more or less than its worth