Step-by-step explanation:
As of my knowledge cutoff in September 2021, there is no specific movie titled "Next Door" from that year that I am aware of. It's possible that there may be a movie released after that date with that title or a different title altogether.
However, in general, movies can address the issue of inequality as a central theme or as a subplot. Many films tackle social, economic, racial, or gender inequality to shed light on these issues and provoke discussions or raise awareness. These movies often explore the experiences of marginalized or underrepresented groups, the challenges they face, and the potential impact of inequality on individuals and society as a whole.
To determine if a specific movie titled "Next Door" from 2021 addresses the problem of inequality, it would be necessary to identify and review the specific film in question.