Question

explain how the level of effective demand is atained in an economy if aggregate demand is more than aggregate supply

Answer 1

First of all keep in mind that demand would be unlimited in respect of supply . Demand is something that we can't control , it's natural , what we can control is supply . To make effective demand, supply has to be interfered with . Increase  the supply to lower the pressure of demand is the only alternative to create a nominal demand in the economy.