AQd = Total expenditure = C+I+G+(X-M)
AQs = real GDP (Y)
Because AQd = AQs in the equilibrium condition ,
So Y = C+I+G+(X-M)

以上是得出 Equilibrium condition 的方法，咁我有個疑問：

Real GDP 唔係等於 C+I+G+(X-M) 咩？
點解 AQs 等於 real GDP 而 AQd 唔係呢？

Kra :AQd = Total expenditure = C+I+G+(X-M)
AQs = real GDP (Y)
Because AQd = AQs in the equilibrium condition ,
So Y = C+I+G+(X-M)

以上是得出 Equilibrium condition 的方法，咁我有個疑問：

Real GDP 唔係等於 C+I+G+(X-M) 咩？
點解 AQs 等於 real GDP 而 AQd 唔係呢？

It depends on the price level is being constant or not.
If we assume the Price level is exogenously determinated and remain unchanged,AD=Y=Real GDP
Vice versa

AS also.

You can also simply apply the qtm model to support this answer
As VM=PQ,where V=Velocity of money,M=Money supply ,P=Price level,Q=Real output.
VM is refer to the AD market and PQ is refer to the AS market.