What is the fine-grained topic of the following text: Though there exist many reservations due to the serious limitations in the data quality and availability, the primary results appear to imply that the possibility of collapse in the ASEAN+3 region’s house prices is smaller than those in the U.S. and European countries. Only return the topic.
Comparison of potential collapse in ASEAN+3 region's house prices with U.S. and European countries