Final answer:
The advantages of depth interviews over traditional focus groups include capturing rich and detailed information and uncovering contradictions. However, depth interviews are not as efficient as focus groups in terms of time and cost.
Step-by-step explanation:
The advantages of depth interviews over traditional focus groups include the ability to capture rich and detailed information from participants, the opportunity for deeper exploration of topics, and the ability to uncover contradictions between what people say and what they actually do. However, there is an exception to these advantages. Depth interviews are not as efficient as focus groups in terms of time and cost. Focus groups allow researchers to gather insights from multiple participants at once, while depth interviews require individual interviews.