use XGUIDE [Acknowledgements to my friend!
You mean acknowledgements leading edge education!
Fiscal policy is used as a shift variable in the keynesian model of aggregate demand.
Fiscal policy involves taxation and government spending.
If AD = C+I+G+X-M then fiscal policy can work by doing two of the following things:
changes in government spending:
AD = C+I+(G+i)+X-M.... As government spending changes by an amount i, AD will increase or decrease by an equal amount (assuming taxation remains unchanged)
changes in taxation:
It impacts on consumption indirectly:
C = MPC x (Y-T)....
Where MPC = marginal propensity to consumer (aggregated economy wide)
Y = Income
T = taxation
(Y-T) = disposable income
Any change in T will directly influence Agg'd howevor not by an equal amount as the MPC is between 0 and 1.
So this is how fiscal policy works. It takes money off people who may otherwise save, and spends it.
Another way fiscal policy works is through the use of deficit budgeting. This is where a government will actuall spend more than it collects through taxation which of course will have a positive effect on growth.
There is really a lot to say about this stuff. Its impossible for me to continue, so if you want me to then just reply.