Sandeep , see if long run equilibrium is given to us , government spending will shift AD upwards , prices will rise and because of vertical AS curve the output remains constant. So government spending is ineffective . Humsee ye thodi pucha hai ki policy effective hai ya nahi , humse to bas outcomes involved in mechanism puche hain .
"Once you eliminate the impossible, whatever remains, no matter how improbable, must be the truth."