In this week’s parashah, the Torah explicitly and unequivocally prohibits exploitative behavior or shady practices in financial transactions: "When you buy or sell merchandise from your fellow, a person shall not exploit his brother" (VaYikra 25:14). Our Rabbis understand this prohibition as relating to the “softer” crimes of overcharging and exploiting a potential business partner’s lack of knowledge about whether or not they are getting a reasonable price, since the Torah already prohibits theft and outright lying.