Final answer:
An advertiser would most likely use the lower involvement hierarchy for household cleaning products, as these are low-cost, bought frequently, and require little research. Luxury cars and expensive jewelry, in contrast, involve an extensive decision-making process due to their higher investment value.
Step-by-step explanation:
An advertiser is more likely to use the lower involvement hierarchy to explain the consumer decision-making process for products which are bought frequently, are low-cost, and require little thought and research before purchase. In this case, among the options provided, household cleaning products fit this description most accurately. Groceries may also seem like a potential answer, but they can encompass a wider range of products, from basic necessities to luxury food items, and therefore might require a mix of decision-making processes depending on the specific item and its importance to the consumer.
Luxury items such as luxury cars and expensive jewelry tend to be high-involvement purchases because they are significant investments and consumers typically engage in an extensive decision-making process, involving a lot of research and consideration before making such purchases. As for the price elasticity of demand, it is typically lower for necessities like food, meaning that consumers will continue to buy them even if the price increases, and higher for luxuries like perfume, meaning consumers are more sensitive to price changes and may reduce their purchase if the price goes up.