The article examines how different methods of calculating house price indices can lead to varying results. By analyzing data from the Spanish housing market between 1994 and 2012, the researchers compared a time dummy hedonic index and an imputed hedonic index. They found that changes in house prices were influenced more by improvements in neighborhood quality than changes in the typical house attributes. The study suggests that socio-demographic conditions play a significant role in house price fluctuations, rather than changes in housing quality.