The present doctoral thesis consists of three chapters of self-contained works about the economics of migration, inequalities, and culture. In the first chapter, I introduce the thesis outline and discuss each chapter's research questions. The second chapter explores the effects of mass migration on individual attitudes towards migrants. Using several data sources for the mass migration of Ukrainians in Poland between 2014-2016, this chapter is focused on how a massive exogenous increase in the stock of migrant residents and migrant co-workers affects the perception of migrants. Using both an IV methodology and a difference-in-difference analysis, I test two hypotheses: the labor market competition and contact theory, and find some evid...