Simplify the following text for a Grade 10 native English-speaking person.
Original: Under the common law and the Uniform Commercial Code in the United States , merchants are held to a higher standard in the selling of products than those who are not engaged in the sale of goods as a profession .
Simplified: Under the common law in the United States , merchants are held to a higher standard in the selling of products than those who are not engaged in the sale of goods as a profession .