What is the fine-grained topic of the following text: ACG expect that over next coming year the three-tier structure of the industry which was 20 percent for the entry-level segment, 60 percent in value for the mid-level and 20 percent at a premium level for the time and the current trend has moved to 30-50-20 percent and it is on its way to moving to 35-40-25 percent structure. Only return the topic.
Industry structure shift in ACG