Why should Gotham's mayor be against it? Because it helps the poor?
Walmart’s benefits are obvious to shoppers and to economists like Jason Furman, who served in the Clinton administration and was chairman of the Council of Economic Advisers under President Obama. In a paper, “Walmart: A Progressive Success Story,” Furman cited estimates that Walmart, by driving down prices, saved the typical American family more than $2,300 annually. That was about the same amount that a family on food stamps then received from the federal government.