assume that (a)the price level is flexible upward but not downward and (b) the economy is currently operating full employ output. Other things equal, how will each of the followeing affect the equilibrium price level and equalibrium level of real output in the short run?a. an increase in agg demandb.a decrease in agg supply with no change in aggregate demandc. equal increases in agreggate demand and agg supplyd. decrease in agg demande. an increase in agg deamnd and exceeds an increase in agg supply