This document summarizes research on theories of ethnicity and race and perspectives on inequalities based on ethnicity and race. It discusses three main theoretical approaches to understanding ethnicity and race: primordialist theories which see ethnic identity as fixed at birth, instrumental theories which view ethnicity as something that can be manipulated for political or economic ends, and constructivist theories which see ethnic identity as fluid and constructed in social contexts. It also examines functionalist and conflict perspectives on inequalities, with functionalism focusing on assimilation and pluralism, and conflict theory emphasizing how dominant groups use power to divide groups along racial and ethnic lines for their own benefit.