I don't think they only surveyed two - the article doesn't say how many or link to the paper, but this could easily be misread as 'they found two fast-food join

I don't think they only surveyed two - the article doesn't say how many or link to the paper, but this could easily be misread as 'they found two fast-food joints': The two found fast-food joints along the New Jersey-Pennsylvania border edit: found it: http://www.nber.org/papers/w4509 http://www.nber.org/papers/w4509 - 410 restaurants