\which of the following statements about the short-run phillips curve is true? outward shifts in aggregate demand lead to a phillips curve that has an inverse relationship between unemployment and inflation. the short-run phillips curve is vertical at the natural rate of unemployment. inward shifts in aggregate supply lead to a phillips curve that has an inverse relationship between unemployment and inflation. along the short-run phillips curve, inflationary expectations increase as unemployment increases. the long-run and short-run phillips curves intersect where the unemployment rate is zero.