Is there really an inequality trap? And does corruption rest more upon social strains – high inequality and low trust – than upon strong institutions? I present evidence in this chapter for the framework that I have outlined in Chapter 2. I also show that there may be direct linkages between inequality and corruption – first by introducing a new measure of inequality that also reflects in-group trust and second by examining cross-national surveys on people's perceptions of corruption. Where some groups fare much better than others in a society, corruption will be much higher. This measure of uneven economic development encompasses both economic inequality and the social strains that lead to high in-group trust and low out-group faith in others. This new measure is strongly related to corruption, but also to almost all of the other determinants of corruption, leading to problems in estimating either direct or indirect effects in a statistical model, but suggesting very strong support for an inequality trap.