Use aggregate supply and demand diagrams to predict the change in GDP and the price level when the following occur {all events only one curve shifts}. Your answer will have a graph for each letter below. a] New varieties of highyielding grains are developed. is} A round of collective bargaining in the industrial sector leads to relatively high wage increases. (:1 Pessimistic business forecasts lead rms to reduce their planned investment. d} An announcement of major increases in social security retirement benets leads people to reduce their personal saving