following argument regarding Phillips Curve by T (true) of F (false) (1)This curve was first developed by a British economist, A. W. Phillips in 1958 which shows vertical relationship between unemployment and nominal wage. (2)During the oil crises of 1970s, short term Phillips curve of United States shifts to the left side. (3)Accord to Milton Friedman and E. Phelps, unemployment and inflation have a long run trade-off relationship. (4)The natural unemployment hypothesis explains why long run Phillips curve is right side upward moving