What is the first step for marketers in implementing the marketing concept? Implementing relationship marketing Investing in an information system to discover customers' real needs Satisfying customer objectives Engaging in personal selling or advertising to promote products that customers desire

The first step for marketers in implementing the marketing concept is to **invest in an information system to discover customers' real needs**. This foundational step involves gathering and analyzing data about customers to understand their preferences, needs, and wants. By doing so, marketers can tailor their strategies and offerings to better meet customer expectations, which is the essence of the marketing concept.