what reason does willy give that he can't work in new york

Linda says that there's no reason why he can't work in New York, but Willy says he's not needed there. Willy claims that if Frank Wagner were alive he would be in charge of New York by now, but that his son, Howard, doesn't appreciate him. Linda tells him that Happy took Biff on a double date, and that it was nice to see them shaving together.