Day 13: Multiplier Effect

I am hungry.

I buy two huge margherita pizzas.

The cost of the pizzas to me is income to the seller. 

What the seller spends out of this income would be income to someone else. 

This goes on and on and on.

This becomes an economy-wide chain reaction, or the "multiplier effect" as Keynes called it. Thus, consumption rather than thrift promotes economic growth, and the government should stimulate demand. Each unit of money it spends increases economic activity, not by one unit, but by one unit times a multiplier. The expenditure more than pays for itself!

This seems like the panacea to all economic evils: the government should just spend and spend and this initial injection will further create waves of spending and thus, reboot the economy. However, this solution of spending more and not worrying about the incoming due bills sounds a bit too idealistic and "too good to be true" to me.