How Effective is Fiscal Policy ?

Fiscal policy is the most important tool in the hands of the government which can enhance the aggregate demand in the economy and hence presents a solution to the looming recession (depression). Keynesian school of economic thought has played an interesting role in encouraging the ruling leader of the country to save the economy through a combination of rising public expenditure and reduced tax collection plans which work with the help of Keynesian Multiplier K = I / 1 - MPC.
Some of real world scenarios are shared below to present details of fiscal stimulus package to stimulate the economic growth to stabilize the economy.

1) USA: 2009 Fiscal stimulus Package

2) UK 2009 Fiscal stimulus

3) China 2009 Fiscal stimulus package.