PPP'P' Explain whether each of the following events shifts the short-run aggregate-supply curve,the aggregate-demand curve. both, or neither. For each event that does shift a curve, use a diagram to illustrate the effect on the economy. There is a reduction in household income tax. A cyclone destroys the year's wheat crop. Households decide to have less children. A signicant amount of iron ore is found in Western Australia, capable of supplying world trade for the next 50 years