The goal of the study was to see if house prices in different regions of Iran stay at a similar level over time. Researchers tested this by looking at data from 20 provinces between 1993 and 2017. They used a new test called Fourier quantile unit root test, along with traditional tests. The results showed that most house prices in Iran tend to follow a random pattern, but the new test found that 15 out of 20 regions actually do not follow this pattern. This means that house prices in these regions are not constantly increasing or decreasing, but rather stay around a stable level. This information can help predict future housing prices more accurately.