Recent research treats symbolic and tangible conflict sources as intertwined rather than competing

Evidence

Whereas Allport primarily identified these different sources of conflict, considerable recent research has attempted to pit symbolic or socialidentity explanations for prejudice against explanations based on tangible conflicts of interest between groups … Thus whereas Allport identified key factors that contribute to competition, current work has gone beyond his initial insights to understand the dynamic relations between different sources of conflict and the more proximate mechanisms that translate conflict into prejudice and discrimination. — John F. Dovidio, Peter Glick, Laurie A. Rudman, On the Nature of Prejudice, 1513