"If the American heart association announces that eating French fries increases the risk of stroke, it will force people who are concerned about their health to reduce the consumption of French fries which will then lead to a fall in the demand of French fries. A product or service that adds value to another refers to as a complement. In other words, they are two goods that the consumer uses together."
"Since French fries and ketchup are complements, a fall in demand of French fries would also lead to a fall in the demand of ketchup and this will shift the demand curve for ketchup to the left."
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