In the United States, longitudinal studies of demographic disparities in hazardous facility siting provide evidence refuting the minority move-in hypothesis, which is the idea that

Minorities move to locations with environmental hazards because of lower housing prices and other market dynamics  

Explanation:

A longitudinal study is an observational study as a cross-sectional study. In this study the researcher not willing to disturb their subjects. In the longitudinal study, the researcher conducts several observations in a longitudinal study from time to time. In this study, the researcher detects the changes and the development in the subjects in the group as well as the individual level.  

So that here in the above context the ideas that have been used were that the minorities move to the location with environmental changes because of the lower housing prices and other dynamics.