One of the difficulties in social research has been to disentangle the effects of race/ethnicity from social class. In two experimental studies with samples of both students and general population (total N = 416), we analyzed the effect of social class, ethnicity and their interaction on prejudice and discrimination using experimental methods. Social class (High vs. Low) and ethnic group (Roma vs. Non-Roma) were manipulated through a cover story. Study 1 showed a main effect of social class, not of ethnicity, on prejudice and discrimination. In Study 2 the effect of social class was replicated, and the interaction effect was also significant for all dependent variables. Results show that negative effects of social class are higher among Roma than non-Roma. Pooled analyses corroborated these findings. Social class is a predictive factor, especially in interaction with ethnicity and should be considered for predicting and reducing prejudiced attitudes and intergroup behaviors fostering inequality.

社会研究的困难之一是将种族/民族的影响与社会阶层分开。在两项针对学生和一般人群样本的实验研究中（总共N = 416），我们使用实验方法分析了社会阶层、种族及其相互作用对偏见和歧视的影响。社会阶层（高与低）和种族（罗姆与非罗姆）是通过封面故事操纵的。研究 1 显示了社会阶层而非种族对偏见和歧视的主要影响。在研究 2 中，社会阶层的影响被复制，交互作用对所有因变量也很显着。结果表明，社会阶层对罗姆人的负面影响高于非罗姆人。汇总分析证实了这些发现。社会阶层是一个预测因素，特别是在与种族的相互作用中，应该考虑预测和减少偏见态度和助长不平等的群体间行为。