Routinized choice behavior occurs after repeated purchases of a brand, leading to habitual buying with minimal decision-making, which is crucial for brand loyalty. Marketers must understand consumer buying patterns to avoid stockouts that may drive loyal customers to competitors, while limited decision-making applies when consumers seek additional information before making a familiar purchase. Extensive problem-solving arises when consumers lack information and must invest time in research for new or significant purchases, necessitating clear communication from marketers to guide the decision-making process.