In a recent article in this journal, Stal and Zuberi (2010) discuss two policy programs targeting areas of concentrated poverty and argue that a multifaceted approach to socio-spatial integration policies can provide significant social benefits to the poor. They base their claim on a comparison of the Moving to Opportunity (MTO) program in the United States and the urban renewal program of the Bijlmermeer in Amsterdam, the Netherlands. In their article, they make several thought-provoking points with regard to the theory of neighborhood effects. Also, they make the important point that MTO programs should also focus on those left behind.