An entrepreneur is someone who starts a business, usually in the form of a corporation that manufactures and sells a product or offers a service. According to Parlay Patz, entrepreneurs are frequently viewed as innovators who identify a problem or opportunity and then develop a solution that no one else has recognized. Testing is one method they use. Entrepreneurs "hire people and invest money to determine whether customers will value the product and whether they can produce and deliver it at a reasonable cost." Once in the market, they frequently discover new, even better ideas."