Dr. Wolff, thank you for your efforts to prevent the demonization of immigrants. However, I don't follow the logic in your latest Economic Update. I understand that undocumented immigrants contribute to the economy through rent, and purchases of food, clothes, ... etc.; but isn't this contribution something that would exist without them as well? If an undocumented worker wasn't there to take a job as a dishwasher, for instance, wouldn't it mean that the job would still be performed, a salary still paid, and this money recycled back into the economy as rent and other purchases? In fact, if this dishwasher wasn't undocumented wouldn't we expect his salary and subsequent contribution to the economy to be larger? While I believe undocumented workers currently in the US deserve a pathway to citizenship from a moral standpoint, I don't see an economic argument that further undocumented workers are beneficial given the current difficulty Americans are having finding work. Even admitting that the damage they do through job displacement is mitigated by their economic contribution, don't you think the resentment building among poor Americans and manipulated by politicians is a danger that needs to be addressed by preventing further immigration of undocumented workers?